There are 101 numbers between 500 and 600. We can ignore all 51 numbers which are even. Hence, we are done with options 2 and 4. The numbers that left are 50. We have to find numbers which multiple of 3 but not even numbers since we already ignore them so such series will have a common difference of 6 which starting number will be 501 and last number will be 597 ⇒ Total number = (Last number – First number)/diff + 1 ⇒ Total number = (597 – 501)/6 + 1 ⇒ Total number = 17 We have 50 – 17 = 33 numbers Now which are not divisible by 2, 3 & 4