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Q: How many two-digit counting numbers are not multiples of 10?

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Related questions

60 numbers

There are 6,750 such numbers.

81 of them.

500

There are 450 of them.

There are 720 of them.

8100

The 3-digit counting numbers are 100 through 999 = 900 numbers.Half them are multiples of 2 (even numbers).The other half are not . . . 450 of them.

4500 of them.

There are 9*10*9 = 810 such numbers.

5 ans 3

45 multiples of 2 plus 30 multiples of 3 minus 15 multiples of 6 equals 60 numbers

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