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If Ar=rr1r1r where r is a natural number then A1+A2+A3+........+A2008  must be equal to

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By Expert Faculty of Sri Chaitanya
a
2008
b
(2006)2
c
(2006)3
d
2007

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detailed solution

Correct option is A

Ar=r2−(r−1)2=2r−1∑r=12008Ar=(2008)2


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