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the number of n digits number which consists of the digits 1&2 only if each digit is to be used atleast once ,is equal to 510 then n is equal to (a)7 (b)8 (c)9 (d)10

the number of n digits number which consists of the digits 1&2 only if each digit is to be used atleast once  ,is equal to 510 then n is equal to
(a)7
(b)8
(c)9 
(d)10

Grade:12th pass

1 Answers

Arun
25763 Points
3 years ago
Dear Ashish

Hope it helps, incase of any difficulty, feel free to ask
Thanks& Regards,
Arun (askIITians forum expert)

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