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the number of n digit number which consist of the digit 1 and2 only if each digit is to be used atleast once is equal to 510 then n equal to a]7 b)8 c)9 d)10

the number of n digit number which consist of the digit 1 and2 only if each digit is to be used atleast once is equal to 510 then n equal to 
a]7
b)8
c)9
d)10

Grade:12th pass

1 Answers

Arun
25758 Points
4 years ago
Hope it helps,in case of any query please feel free to askThanks & Regards,HiArun (askIITians forum expert)

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