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Question

A variable name in certain computer language must be either an alphabet or an alphabet followed by a decimal digit. The total number of different variable names that can exist in that language is equal to


A
280
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B
290
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C
286
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D
296
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Solution

The correct option is C 286
Number of variable names if only alphabet is used is 26.
Now if every alphabet is followed by decimal digit, then Number of variable names are =26×10=260

Hence total number of different variable names possible are 
=26+260=286

 

Mathematics

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