Spiral


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schedule 3 Hours
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Starting with the number 1 and moving to the right in a clockwise direction a 5 by 5 spiral is formed as follows:

21 22 23 24 25
20  7  8  9 10
19  6  1  2 11
18  5  4  3 12
17 16 15 14 13

It can be verified that the sum of the numbers on the diagonals is 101.

What is the sum of the numbers on the diagonals in a 1001 by 1001 spiral formed in the same way?

how to do it?? please give the answer fully

Nov 14th, 2013

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Nov 14th, 2013

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Nov 14th, 2013
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Nov 14th, 2013
Nov 20th, 2017
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