Question

which of the following will complete the series? 17,23,37,53

Answer 1

17 23 37 53 67 93 117 123

Answer 2

57

$17 \: to \: 37 \: \: \: + 20 \\ and \: 23 \: to \: 53 \: \: \: + 30 \\ so \: to \: get \: next \: step \: that \: is \: x7 \: series \: we \: need \: to \: add \: 20 \: \\ so \: answer \: is \: 57$