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Home  >>  CBSE XI  >>  Math  >>  Permutations and Combinations
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A variable name in certain computer language must be either a alphabet or a alphabet followed by a decimal digit.Total number of different variable names that can exist in that language is equal to

$\begin{array}{1 1}(A)\;280\\(B)\;290\\(C)\;286\\(D)\;296\end{array} $

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1 Answer

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Total variables if only alphabet is used =26
Total variables if alphabets and digits both are used =$26\times 10$
$\Rightarrow 260$
Total variables =$26(1+10)$
$\Rightarrow 26(11)$
$\Rightarrow 286$
Hence (C) is the correct answer.
answered May 19, 2014 by sreemathi.v

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