Math Is Fun Forum

RauLiTo

Member

From: Bahrain

Registered: 2006-01-11

Posts: 142

Android Lock Patterns

I miss this forum very much and I came back to it with one question ... Let's try !

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The pictures above show Android lock screen ... you can lock your mobile by one patterns like the above contain 3 digits minimum and 10 maximum. How many different pattern can you make ?

Note: you can go cross i.e from 1 to 8 or from 6 to 7 ...

my answer is : 18******* !
any different answers ?

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ImPo$$!BLe = NoTH!nG
Go DowN DeeP iNTo aNyTHinG U WiLL FinD MaTHeMaTiCs ...

RauLiTo

Member

From: Bahrain

Registered: 2006-01-11

Posts: 142

Re: Android Lock Patterns

Is it very hard ?!

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ImPo$$!BLe = NoTH!nG
Go DowN DeeP iNTo aNyTHinG U WiLL FinD MaTHeMaTiCs ...

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Android Lock Patterns

Hi;

He thinks so.

http://devingaffney.com/posts/listing-o … mbinations

Also he thinks he has listed them all.

http://devingaffney.com/files/random_is … k_list.txt

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

RauLiTo

Member

From: Bahrain

Registered: 2006-01-11

Posts: 142

Re: Android Lock Patterns

Thanks for sharing that link bobbym ... any other thoughts ?

---

ImPo$$!BLe = NoTH!nG
Go DowN DeeP iNTo aNyTHinG U WiLL FinD MaTHeMaTiCs ...

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Android Lock Patterns

Hi;

None that are useful. But I do have a question or two.

1) How do you get 10 maximum instead of 9?

2)

my answer is : 18******* !

I am not following that. What does it mean?

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

RauLiTo

Member

From: Bahrain

Registered: 2006-01-11

Posts: 142

Re: Android Lock Patterns

Hello bobbym ... I am using android lock as an application in the iPhone and I just discovered that its different from the original one in andoird ... first it can have from 3 to 10 digits and second I can use the digit more than one time in the same pattern.

my answer is 187209804 ... I used excel in solving it ... !

Any other thoughts ?!

---

ImPo$$!BLe = NoTH!nG
Go DowN DeeP iNTo aNyTHinG U WiLL FinD MaTHeMaTiCs ...

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Android Lock Patterns

Hi RauLiTo;

Offhand I would say that it will require a computer program to do it.

If you would provide your breakdown:

3 digits = ?
4 digits = ?
5 digits = ?
.
.
.
10 digits = ?

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

RauLiTo

Member

From: Bahrain

Registered: 2006-01-11

Posts: 142

Re: Android Lock Patterns

---

ImPo$$!BLe = NoTH!nG
Go DowN DeeP iNTo aNyTHinG U WiLL FinD MaTHeMaTiCs ...

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Android Lock Patterns

Hi RauLiTo;

Thank you for providing that.

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

RauLiTo

Member

From: Bahrain

Registered: 2006-01-11

Posts: 142

Re: Android Lock Patterns

Welcome ... what do you think ?!

---

ImPo$$!BLe = NoTH!nG
Go DowN DeeP iNTo aNyTHinG U WiLL FinD MaTHeMaTiCs ...

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Android Lock Patterns

Hi RauLiTo;

What are looking to do? You already have the answer so what exactly do you need?

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

RauLiTo

Member

From: Bahrain

Registered: 2006-01-11

Posts: 142

Re: Android Lock Patterns

I am not sure if it is the right answer or not .... its a question come to my mind and I wanted to share it with you guys to see what is the correct answer ... Share please !

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ImPo$$!BLe = NoTH!nG
Go DowN DeeP iNTo aNyTHinG U WiLL FinD MaTHeMaTiCs ...

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Android Lock Patterns

Can you post all the 3 ( 372 of them ) move patterns?

Supposing you had the feature of 2 digits for a move pattern. How many of them would you get?

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In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.