1. Write all the possible 2-digit numbers that can be formed by using the digits 7, 3 and 5, if the repetition
of the digits is allowed.
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Answer:
73 75 37 35 57 53 is all possible two digit no of 7 3 6
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9 numbers
A two-digit number has two places.
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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