How many integers N are prime numbers in the range 200 < N < 220?  Pick one:
A) 1 B) 2 C) 3 D) 4 E) 5
To test a number N on whether it is a prime number , take square root(N) .   Consider as it is if it is a natural number. Otherwise, increase the sq. root to the next natural no.   Then divide given no. by all prime numbers BELOW the sq. root obtained.   If the no. is divisible by any of the prime numbers, then it is not a prime number; else it is.   Square root of 200 or 220 is less than 15   So, lets check if any number between 200 and 220 is not divisible by prime numbers 2,3,5,7,11(&lt;15). That's it.   Out: 201, 202, 203, 204, 205, 206, 207, 208, 209, 210,   212, 213, 214, 215, 216, 217, 218, 219   Only 211 is a prime number in the given range   Correct Option : 1
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How many integers N are prime numbers in the range 200 < N < 220?