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If log 2,log 2n1 and 2n+3 are in AP, then n is equal to

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a
52
b
log2 ⁡5
c
log3 ⁡5
d
32

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detailed solution

Correct option is B

Since, 1og2 , log(2n -1) and log (2n+ 3) are in AP. ∴2log⁡2n−1=log⁡2+log⁡2n+3⇒2n−12=22n+3⇒2n−52n+1=0As 2n cannot be negative hence, 2n−5=0⇒ 2n=5⇒n=log2⁡5


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