I knowingly added this question because it's equivocal. I saw the question somewhere and solved it only for the publisher to tell I was wrong. Solved it another way and got a different answer (correct according to the publisher). I included the two answers in the options!
First Answer Difference between 15 and 7 = 8 Difference between 31 and 15 = 16 So, the series is n + (8 x y). Where y > 1 and n = previous number and y = position of previous number
I knowingly added this question because it's equivocal. I saw the question somewhere and solved it only for the publisher to tell I was wrong. Solved it another way and got a different answer (correct according to the publisher). I included the two answers in the options!
First Answer Difference between 15 and 7 = 8 Difference between 31 and 15 = 16 So, the series is n + (8 x y). Where y > 1 and n = previous number and y = position of previous number
So, answer = 31 + (8 x 3) = 31 + 24 = 55
Second Answer 15 = (7 x 2) + 1 31 = (15 x 2) + 1
So, answer = (31 x 2) + 1 = 63
Answer: both 55 and 63 are correct
BY Riddles Repository - Answers
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