Answer to Q103
2, 3, 5, 7, 11, X
This is just a list of prime numbers, next prime number is 13
Answer: 13
PS: to those that choose 17, you went by
3 + 5 - 1 = 7
5 + 7 - 1 = 11
7 + 11 - 1 = 17
But, see it doesn't work for 2 + 3 - 1 which is 4 and not 5, that's how you should know 17 can't be the answer.
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