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Daxeel Soni Grade: 11
        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.
5 years ago

Answers : (1)

Arun Kumar
IIT Delhi
askIITians Faculty
256 Points
										Hi

Thanks & Regards, Arun Kumar, Btech,IIT Delhi, Askiitians Faculty
3 years ago
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