Let . Find the 2013-th digit after the decimal comma of

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- Jan 27th 2013, 11:02 PMleezangqeFind the 2013-th
Let . Find the 2013-th digit after the decimal comma of

- Jan 30th 2013, 09:43 PMleezangqeRe: Find the 2013-th
help me!!

- Jan 31st 2013, 08:25 AMearthboyRe: Find the 2013-th
If you try to the add the terms you will notice that you will get a long string of 1's.

so you will find,

let

now (we first multiply both sides by N and then take square roots of both sides)

also

therefore,

therefore we have showed that

As is between and , its value would be something like .

Notice

dividing both sides by brings the decimal point forward by n places so value of is__2012 3's__followed by__2012 3's after the decimal point__.We have to find the th digit after the decimal point, which happens to be the first digit after decimal point in .so

(with 2n 1's and 2n 0's)

Noe in order to find the first digit after decimal point, we use approximation.we use just one decimal place and square it to make it just small(or the first small value) below our intended square number.

After working with small numbers, a pattern emerge:

(which is larger than required)

(which is larger than required)

(which is larger than required)

(which is just smaller as 111...11>111...10)

So the required first digit after decimal point should be 1

or the 2013th digit should be 1.

Hope I explained clearly.Explaining this was hard (Whew)