Question

How many 3 digit nos can be formed without using the digits 0,2,3,4,5and 6?

Answer 1

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Answer 2

The full set of digits is 0,1,2,3,4,5,6,7,8,9

You want omit the set 0,2,3,4,5,6

The set remaining is 8,1,9,7.

This means that there are four possibilities for each of the three digits, hence 4^3 possibilities overall.

And since 4^3 is 64.

Therefore, 64 numbers can be formed.