How many two digit numbers can be formed by using the digits 1 2 3 4 repetition of digits is allowed )?

Solution:

A two-digit number has 2 digits, one at the units place and one at the tens place.

Let's form the two-digit numbers using the digits 3, 7, and 9 if the repetition of the digit is allowed.

Below are all the numbers formed using the digits 3, 7, 9 with 3 at tens place:

33, 37, 39

Below are all the numbers formed using the digits 3, 7, 9 with 7 at tens place:

73, 77, 79

Below are all the numbers formed using the digits 3, 7, 9 with 9 at tens place:

93, 97, 99

Therefore, the two-digit numbers formed by using the digits 3, 7, and 9 are 33, 37, 39, 73, 77, 79, 93, 97, and 99.

Summary:

All possible two-digit numbers formed by using the digits 3, 7, and 9 if repetition of the digit is allowed are 33, 37, 39, 73, 77, 79, 93, 97, and 99.

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