Oral puzzles

Jai Ganesh · 2018-02-14 01:33:24

Hi,

.

#3921. A child has a block in the shape of a cube with one letter written on each face as shown below:
A B C D E A
The cube is thrown once. What is the probability of getting (i) A? (ii) D?

Monox D. I-Fly · 2018-02-14 15:36:07

Jai Ganesh · 2018-02-14 16:52:23

Hi,

The solution #3921 (both parts) is correct. Neat work, Monox D. I-Fly!

#3922. A jar contains 24 marbles, some are green and others are blue. If a marble is drawn at random from the jar, the probability of it being green is 2/3. Find the number of blue marbles in the jar.

Monox D. I-Fly · 2018-02-14 17:29:15

Jai Ganesh · 2018-02-14 19:06:51

Hi,

The solution #3922 is correct. Neat work, Monox D. I-Fly!

#3923. A number x is selected from the numbers 1, 2, and 3 and a second number y is randomly selected from the numbers 1, 4, and 9. What is the probability of the product xy of the two numbers being less than 9?

Monox D. I-Fly · 2018-02-14 19:20:13

Jai Ganesh · 2018-02-14 21:09:54

Hi,

The solution #3923 is correct. Excellent, Monox D. I-Fly!

#3924. Two unbiased dice are thrown. Find the probability of the sum on the dice is greater than 10.

Monox D. I-Fly · 2018-02-15 19:18:56

Jai Ganesh · 2018-02-15 21:12:12

Hi,

The solution #3924 is correct. Keep it up, Monox D. I-Fly!

#3925. Five cards - ten, jack, queen, king, and an ace of diamonds are shuffled face downwards. One card is picked at random. If a king is drawn first and put aside, what is the probability of the second card being picked by the ace?

Jai Ganesh · 2018-02-16 18:10:17

Hi,

.

#3926. From a pack of 52 cards, jacks, queens, kings, and aces of red color are removed. From the remaining, a card is drawn at random. Find the probability of the card being drawn is (i) a black queen (ii) a red card.

Monox D. I-Fly · 2018-02-16 22:39:01

Jai Ganesh · 2018-02-17 00:14:10

Hi,

.

#3927. From a pack of 52 cards, jacks, queens, kings, and aces of red color are removed. From the remaining, a card is drawn at random. Find the probability of the card being drawn is (i) a black jack (ii) a picture card (jacks, queens, and kings are picture cards).

Jai Ganesh · 2018-02-19 00:20:51

Hi,

.

#3928. A bag contains 8 red, 6 white, and 4 black balls. A ball is drawn at random from the bag. Find the probability of the drawn ball being
(a) red or white
(b) not black.

Jai Ganesh · 2018-02-20 15:05:01

Hi,

.

#3929. A bag contains 8 red, 6 white, and 4 black balls. A ball is drawn at random from the bag. Find the probability of the drawn ball being neither white nor black.

Jai Ganesh · 2018-02-22 00:52:29

Hi,

.

#3930. 12 defective are accidentally mixed with 132 good ones. It is not possible to just look at the pen and tell whether or not it is defective. One pen is taken out at random from this lot. Determine the probability of the pen taken out is good one.

Jai Ganesh · 2018-02-24 00:20:00

Hi,

.

#3931. In a simultaneous throw of a pair of dice, find the probability of getting
(i) neither 9 nor 11 as the sum of the numbers on the faces
(ii) a sum less than 6.

Monox D. I-Fly · 2018-02-25 13:25:48

Jai Ganesh · 2018-02-25 14:10:48

Hi,

The solution #3931 (two parts) is correct. Excellent, Monox D. I-Fly!

#3932. In a simultaneous throw of a pair of dice, find the probability of getting
(i) a sum more than 7
(ii) at least once.

Jai Ganesh · 2018-02-25 14:27:36

Hi,

The solution #3931 (two parts) is correct. Excellent, Monox D. I-Fly!

#3932. In a simultaneous throw of a pair of dice, find the probability of getting
(i) a sum more than 7
(ii) a doublet of odd numbers.

Jai Ganesh · 2018-02-27 00:22:31

Hi,

.

#3933. Five cards - ten, jack, queen, king, and an ace of diamonds are shuffled face downwards. One card is picked at random. What is the probability of a queen?

Monox D. I-Fly · 2018-02-27 13:24:47

Jai Ganesh · 2018-02-27 14:12:14

Hi,

.

#3934. A card is drawn at random from a pack of 52 cards. Find the probability of the card drawn being spade or an ace.

Jai Ganesh · 2018-02-28 14:31:49

Hi,

#3935. A card is drawn at random from a pack of 52 cards. Find the probability of the card drawn being neither a king nor a queen.

Monox D. I-Fly · 2018-02-28 19:07:36

Jai Ganesh · 2018-02-28 20:51:15

Hi,

The solution #3935 is correct. Good work, Monox D. I-Fly!

#3936. Find the centroid of the triangle whose vertices are (1,4), (-1,-1), and (3,-2).

Math Is Fun Forum

#5726 2018-02-14 01:33:24

Re: Oral puzzles

#5727 2018-02-14 15:36:07

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#5728 2018-02-14 16:52:23

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#5729 2018-02-14 17:29:15

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#5730 2018-02-14 19:06:51

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#5731 2018-02-14 19:20:13

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#5732 2018-02-14 21:09:54

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#5733 2018-02-15 19:18:56

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#5734 2018-02-15 21:12:12

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#5735 2018-02-16 18:10:17

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#5736 2018-02-16 22:39:01

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#5737 2018-02-17 00:14:10

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#5738 2018-02-19 00:20:51

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#5739 2018-02-20 15:05:01

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#5740 2018-02-22 00:52:29

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#5741 2018-02-24 00:20:00

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#5742 2018-02-25 13:25:48

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#5743 2018-02-25 14:10:48

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#5744 2018-02-25 14:27:36

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#5745 2018-02-27 00:22:31

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#5746 2018-02-27 13:24:47

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#5747 2018-02-27 14:12:14

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#5748 2018-02-28 14:31:49

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#5749 2018-02-28 19:07:36

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