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Positive integers a(1) , a(2), a(3) , ……...

Positive integers `a_(1) , a_(2), a_(3) , …………... ` form an arithmetic progression (A. P.). If `a_(1)` = 5 and `a_(4)` = 25, then `a_(6)` is equal to

A

`2a_(1)`

B

`3a_(1)`

C

`a_(1) + a_(2)`

D

`a_(1) +a_(3)`

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The correct Answer is:
B
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