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Q: How many two digit numbers are there?

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There are 21 two-digit prime numbers.

There are five such numbers.

7 two-digit numbers.

13

18

18 of them.

There are 45 of them.

36

There are 2941 4-digit numbers such no two of its digits differ by 1.

There are 30 such numbers.

90

The digits product of two digit has number four

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