10 second questions

santhosh · 2010-07-21 05:42:43

for 7 q?

bobbym · 2010-07-21 05:56:20

This is a well known one:

All rows columns and diagonals should sum to 15. But I am not sure what a side total is.

http://www.mathematische-basteleien.de/magsquare.htm

You should try work on these yourself. In a truly szen like experience, it doesn't matter whether you solve the problem or not, the trying is the key!

bobbym · 2010-07-21 06:24:18

santhosh wrote:

giv me ansr 4 What is so special about the number 2.7182818284.... to mathematicians

This one you can look up for yourself. Try googling for it. Google is your friend!

Jai Ganesh · 2010-07-22 01:13:03

Hi bobbym,

The replies to 2212 and 2213 are perfect. Neat job!

#2214. If three coins are tossed, then what is chance of getting exactly one head?

#2215. Four coins are tossed simultaneously. What is the probability of getting exactly one tail?

bobbym · 2010-07-22 01:34:28

Hi ganesh;

Jai Ganesh · 2010-07-23 01:21:14

Hi bobbym

The replies to 2214 and 2215 are perfectly. Well done!

#2216. What is the probability that
(i) a leap year selected at random will contain 53 Sundays.
(ii) a non-leap year selected at random will contain 53 Sundays.

#2217. Two dice are thrown. What is the probability of getting
(i) the same number on both dice
(ii) a total of face number 12.

bobbym · 2010-07-23 01:31:10

Hi ganesh;

Jai Ganesh · 2010-07-24 01:13:48

Hi bobbym,

The solutions to 2216 and 2217 are perfect. Congratulations!

#2218. Three dice are rolled once. What is the chance that the sum of the face numbers on the three dice is greater than 15?

#2219. A point is chosen at random inside a circle of radius 2. What is the probability that this point is nearer to the centre than to the circle.

bobbym · 2010-07-24 02:00:44

Hi ganesh;

Jai Ganesh · 2010-07-25 01:18:22

Hi bobbym,

The solutions to 2218 and 2219 are perfect. Keep it up!

#2220. Find the equation of a straight line parallel to x-axis and passing through the point (-3,2).

#2221. Find the equation of a straight line parallel to y-axis and passing through the point (-7,5).

#2222. Find the equation of a straight line whose inclination with x-axis 60 degrees and passes through the origin.

bobbym · 2010-07-25 01:20:45

Hi ganesh;

Jai Ganesh · 2010-07-25 02:05:01

Hi bobbym,

The solutions 2220, 2221 and 2222 are correct. Great work!

#2223. Find the equation of a straight line whose inclination is 30 degrees with the x-axis and whose y-intercept is -3.

#2224. Find the equation of a straight line whose slope is 3/4 and y-intercept is -4.

bobbym · 2010-07-25 03:05:34

Hi;

Jai Ganesh · 2010-07-26 01:12:15

Hi bobbym,

The solutions to 2223 and 2224 are perfect. Very good!

#2225. Find the equation of the straight line through (1,3) and parallel to a straight line 5x-3y+1=0.

#2226. Find the equation of a straight line through (0,7) and perpendicular to a straight line 5x+4y+11=0.

bobbym · 2010-07-26 01:19:52

Hi ganesh;

Jai Ganesh · 2010-07-27 01:02:17

Hi bobbym,

The solutions to 2225 and 2226 are perfect. Brilliant!

#2227. The vertices of a triangle are (1,2), (-3,4) and (5,-3). Find the equation of the altitude from (1,2) to the opposite side.

#2228. Find the equation of the perpendicular bisector of the line joining the points A(1,7) and B (-3,3).

bobbym · 2010-07-27 01:19:42

Hi ganesh;

Jai Ganesh · 2010-07-28 00:54:15

Hi bobbym,

The solutions to 2227 and 2228 are correct. Well done!

#2229. Find the equation of the straight line which joins the points A(5,1) and B(-2,2).

#2230. The vertices of a triangle ABC are A(-2,8), B(1,2) and C(7,-8). Find the equation of the median through A.

bobbym · 2010-07-28 01:03:08

Hi;

Jai Ganesh · 2010-07-29 01:24:12

Hi bobbym,

The solution to 2229 correct.However, the solution to 2230 is 11x+6y-26=0.

Well done!

#2231. Show that the points (4,2), (7,5), and (9,7) are collinear.

#2232. If the straight line 7x-5y=k passes through the points (1,1) what is k?

bobbym · 2010-07-29 01:31:19

Hi ganesh;

Sorry about # 2230, must have made an arithmetic mistake somewhere. Yep, checked it you are correct.

Jai Ganesh · 2010-07-30 01:15:29

Hi bobbym,

The problems to 2231 and 2232 are solved correctly. Well done!

#2233. In an Arithmetic Progression the sum of the first 7 terms is 10 and that of the next 7 terms is 17. Find the AP.

#2234. How many terms of the AP 3,7,11,........ are needed to yield the sum 1275?

bobbym · 2010-07-30 07:06:11

Hi ganesh;

Jai Ganesh · 2010-07-30 19:13:20

Hi bobbym,

The problems 2233 and 2234 are solved correctly. Excellent!

#2235. Find the sum: 3 + 11 + 19 + .... 787.

#2236. Find the sum of all the numbers between 300 and 500 divisible by 11.

bobbym · 2010-07-30 19:29:03

Hi ganesh;

Math Is Fun Forum

#1526 2010-07-21 05:42:43

Re: 10 second questions

#1527 2010-07-21 05:56:20

Re: 10 second questions

#1528 2010-07-21 06:24:18

Re: 10 second questions

#1529 2010-07-22 01:13:03

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#1530 2010-07-22 01:34:28

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