a≠0 হলে (a-1)-1 এর সঠিক মান-

A a2

B a-1

C a-2

D a

Solution

Correct Answer: Option D

(a-1)-1 (যেখানে a≠0)

= 1/(a-1) (সুত্রঃ a-1 = 1/a)

= 1/(1/a)
= a

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