Question

Write all possible 2-digit numbers that can be formed by using the digit 3,7 and 9 if the repetition of digit is allowed. step by step

Answer 1

Answer:

33, 35, 37, 53, 55, 57, 73, 75 and 77.

Step-by-step explanation:

The ten's place can be filled in 3 ways; and for each of the ways, the unit's place can be filled in 3 ways. So, there will be 3*3 = 9 numbers. These are: 33, 35, 37, 53, 55, 57, 73, 75 and 77.

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