(১)100 টি প্রশ্ন হতে কয়ভাবে এক বা একাধিক answer করা যাবে? Ans:100C1+100C2+....+100C100=2^100 -1

Translation:

Q. We have 100 questions. In how many ways can we answer at least one question?

Ans. 100C1+100C2+....+100C100=2^100 -1

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