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If twice the 11th term of an AP is equal...

If twice the 11th term of an AP is equal to 7 times its 21st term, then its 25th term is equal to

A

24

B

120

C

0

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
D
Since, `2T_(11)=7 T_(21)`
`rArr 2(a+10d)=7(a+20d)`
`rArr 2a+20d=7a+140d`
`rArr a= -24d`
`therefore T_(25)=-24d+24d=0`
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