Q.

If Ar=rr−1r−1r where r is a natural number then A1+A2+A3+…........+A2008  must be equal to

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a

2008

b

(2006)2

c

(2006)3

d

2007

answer is A.

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Detailed Solution

Ar=r2−(r−1)2=2r−1∑r=12008Ar=(2008)2
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If Ar=rr−1r−1r where r is a natural number then A1+A2+A3+…........+A2008  must be equal to