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Q.

In an AP, if a4=8  a=2, then find its common difference.


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a

6

b

4

c

2

d

10  

answer is C.

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Detailed Solution

In the given AP, a4=8 and a=2.
We know that, nth term of an AP with d be the common difference is given by,
an=a+(n-1)d ⇒ a4=a+(4-1)d ⇒ 8=2+3d ⇒ 3d=6 ⇒ d=2
Hence, the correct option is 3.
 
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In an AP, if a4=8  a=2, then find its common difference.