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

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

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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

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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

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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