Math Is Fun Forum

juantheron

Member

Registered: 2011-10-19

Posts: 312

a.p,g.p probability

three no. are choosen from the set {1,2,3,4,......,2011}. then find the probability that the no. are in

(1) arithmetic progression

(2) Geometric progression

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: a.p,g.p probability

unless you mean consecutive terms of an a.p. and g.p. ,the probability is 1.

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“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: a.p,g.p probability

Hi anonimnystefy;

Is 1,2 and 5 in arithmetic progression? So it can not be 1.

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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.

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: a.p,g.p probability

what about this one: 1,2,3,4,5,...

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“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: a.p,g.p probability

What about it. For a probability to be 1 every case of 3 numbers would have to be in arithmetic progression. One counterexample is enough.

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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.

juantheron

Member

Registered: 2011-10-19

Posts: 312

Re: a.p,g.p probability

three no. are choosen from the set {1,2,3,4,......,2011}. then find the probability that they  are 

(1)  three consecutive no. of an arithmetic progression

(2)  three consecutive no. of an Geometric progression

i have edit my questions

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: a.p,g.p probability

hi bobbym

i don't understand what you're talking about.

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“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: a.p,g.p probability

Hi;

Oh I see he edited the question to consecutive numbers. The first question is different.

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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.

jonny

Guest

Re: a.p,g.p probability

how can i solve it

thank

gAr

Member

Registered: 2011-01-09

Posts: 3,482

Re: a.p,g.p probability

Hi,

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"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense"  - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."