a-[a-{a-(a-1)}] এর মান কত?

A 1

B a-1

C a+1

D -1

Solution

Correct Answer: Option A

a-[a-{a-(a-1)}] 

= a - [a-{a-a+1}] = a - [a-1] = a - a + 1 = 1 

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