The number of \( n \) digit numbers which consists of the digits \(...

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The number of \( n \) digit numbers 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:
\( \mathrm{P} \)
(A) 7
(B) 8
(C) 9
(D) 10
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