Q.

If 2nd term of GP is 24 and 5th term is 81 then the first term is

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a

16

b

18

c

21

d

12

answer is A.

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Detailed Solution

2nd  term  of G.P= 24⇒ar=24 −−−(1)      5th term=81⇒ar4=81−−−(2) (2)(1)⇒ar4ar=8124⇒r3=278⇒r=32(1)⇒a(32)=24⇒a=16
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