Number of prime numbers between 1 to 50 are
18
12
15
20
Prime numbers are the positive integers which have only two factors,1 and the number itself.
Prime numbers between 1 and 50 are 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47 which counts to 15.
Hence, the number of prime numbers between 1 to 50 are 15.