Two.
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there are 39 whole numbers between 21 and 61
Four. The prime numbers between 10 and 21 are 11, 13, 17, and 19.
Infinitely many. In general, between ANY two DIFFERENT numbers, there are infinitely many other numbers.
There are 2 primes between 21 and 29 inclusive: 23 & 29.
21 numbers - if you include the 10 and the 50.