Which number is unsuitable in the following series? 5, 3, 6, 10, 9, 12, 17, 15, 18, 23

Find the missing number in the following number series. 3, 5, 8, 10, ?, 15, 18, 20

Which number should replace ‘?’ in the following series? 240, 120,? , 180, 360, 900

Which term is wrong in the following series? 8, 13, 21, 32, 47, 63, 83

What will be the next number in the following number series? 48, 24, 72, 36, 108, ?

Find the wrong number in the following series : 135, 226, 353, 552, 739