a−3 = 0.2 হলে a12 = কত?

A ২৫

B ৬২৫

C ১২৫

D

Solution

Correct Answer: Option B

a-3 = 0.2

=>1/a3 = 2/10

=>a3 = 10/2

=>(a3)4 = (5)4 

∴ a12=625

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