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Let `a_n, n in N` is an A.P with common difference `d` and all whose terms are non-zero. If n approaches infinity, then the sum `1/(a_1a_2)+1/(a_2a_3)+....1/(a_na_(n+1))` will approach

A

`(1)/(a_(1)d)`

B

`(2)/(a_(1)d)`

C

`(1)/(2a_(1)d)`

D

`a_(1)d`

Text Solution

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The correct Answer is:
A
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