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In an AP, if d = -4, n = 7 and a(n) = 4,...

In an AP, if d = -4, n = 7 and `a_(n)` = 4, then a is equal to

A

6

B

7

C

20

D

28

Text Solution

Verified by Experts

The correct Answer is:
D
In an AP, ` a_(n)=a+(n-1)d`
`implies 4=a+(7-1)(-4) " " `[by given conditions]
`implies4=a+6(-4)`
`implies 4+24=a`
`:. " " a=28`
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Knowledge Check

  • In an AP, if a = 1 , a_(n)= 20 and S_(n) = 399 , then n is equal to

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