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Question

# How many different numbers of 2-digits can be formed with the digits 1, 2, 3, 4, 5, 6; no digits being repeated?

A
40
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B
30
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C
35
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D
45
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E
None of these
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Solution

## The correct option is B 30We have to fill up two places (since numbers are of 2 digits. The first place can be filled up in 6 ways. as any 1 of the 6 digits can be placed in the first place. The 2nd place can be filled up in 5 ways as no digit is to be repeated. Hence, both places can be filled up in 6×5=30 ways.

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