Arithmetic Ability
Permutations and Combinations

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Q.

Using numbers from 0 to 9 the number of 5 digit telephone numbers that can be formed is

View Answer

Correct choice: C

Explanation:

The numbers 0,1,2,3,4,5,6,7,8,9 are 10 in number while preparing telephone numbers any number can be used any number of times. This can be done in 105 ways, but '0' is there So, the numbers starting with '0' are to be excluded is 94 numbers. Total 5 digit telephone numbers = 105− 94= 3439
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