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The number of n digit numbers which consists of the digit 1 & 2 only if each is to be used at least once, is equal to 510 then n is equal to_____ (A) 7 (B) 8 (C) 9 (D) 10 Please explain step by step.

The number of n digit numbers which consists of the digit 1 & 2 only if each is to be used at least once, is equal to 510 then n is equal to_____
(A) 7
(B) 8
(C) 9
(D) 10
Please explain step by step.

Grade:11

1 Answers

Arun Kumar IIT Delhi
askIITians Faculty 256 Points
7 years ago
Hi

Thanks & Regards, Arun Kumar, Btech,IIT Delhi, Askiitians Faculty

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