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<Maths><Challenge> 2

TOPIC id: 70490

Replies: 7 - Views: 852

Replies: 7 - Views: 852

ronniebasak22 2011-01-08 13:22:21

Can u solve it?(my phone dont have plus, pls consider "@" as Plus)

1 @ 1/2 @ 1/4 @ 1/16 @ 1/32 .....(n)< X

i.e sum of these can never reach a number. what is the least value of it.

here, n can b any positive number (including infinity)

Can u solve it?(my phone dont have plus, pls consider "@" as Plus)

1 @ 1/2 @ 1/4 @ 1/16 @ 1/32 .....(n)< X

i.e sum of these can never reach a number. what is the least value of it.

here, n can b any positive number (including infinity)

ronniebasak22 2011-01-08 13:25:25

by the way the terms are in GEOMETRIC PROGRESSION. but I don't know if u calculate it with sum of G.P formula. Try it..

by the way the terms are in GEOMETRIC PROGRESSION. but I don't know if u calculate it with sum of G.P formula. Try it..

ronniebasak22 2011-01-08 21:32:48

Sorry, plz note the sign

its not "=" its "<". I know that any one can solve it with "=". The series can never reach a number. what is the least value. The sum was discovered by Srinivas Ramanujan. And its logical sum nt imaginary.

Sorry, plz note the sign

its not "=" its "<". I know that any one can solve it with "=". The series can never reach a number. what is the least value. The sum was discovered by Srinivas Ramanujan. And its logical sum nt imaginary.

ronniebasak22 2011-01-08 21:37:36

Clue: the number is not greater than 10 and not less than 1. And its a Natural number that means it can neither be fractional nor include "n".

Clue: the number is not greater than 10 and not less than 1. And its a Natural number that means it can neither be fractional nor include "n".

ronniebasak22 2011-01-09 21:10:29

Anybuddy cant.

Pls ans.

The problem was given by a class X(10)Student..

Try it.

Anybuddy cant.

Pls ans.

The problem was given by a class X(10)Student..

Try it.

ronniebasak22 2011-01-10 10:14:56

Yes! The ans is always less than 2. because.

2-1=1 but it added 1/2.

2-3/2=1/2 but it added 1/4.

.etc

So as u go on it adds half of the distance to reach 2. So 2 is the least value.

Yes! The ans is always less than 2. because.

2-1=1 but it added 1/2.

2-3/2=1/2 but it added 1/4.

.etc

So as u go on it adds half of the distance to reach 2. So 2 is the least value.

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