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Question

The total number of 4 digit numbers that can be formed by using the digits 1,2,3,4,5,6 and 7 if at least one digit is repeated is

A
74
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B
7P4
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C
74 7P4
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D
7P4×4!
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Solution

The correct option is C 74 7P4
The numbers that can be formed when
repetition of digits is allowed are 74.

The numbers that can be formed when
all the digits are distinct or when repetition is not allowed are 7P4

The numbers that can be formed when at least one digit is repeated =74 7P4

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