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Home  >>  CBSE XI  >>  Math  >>  Permutations and Combinations
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How many 10 digit numbers can be written using digits (9 and 2) ?

$\begin{array}{1 1}(A)\;10C_1+9C_2\\(B)\;2^{10}\\(C)\;10C_2\\(D)\;10!\end{array} $

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1 Answer

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Total number of numbers =$2\times 2.....\times 10$ times
$\Rightarrow 2^{10}$
Hence (B) is the correct answer.
answered Jun 20, 2014 by sreemathi.v
 

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