Find next number: 2,6,12,20,?

Find the next number in the series: 9, 20, 38, 65, ___

Find wrong number: 20,40,200,400,2000,4000,8000

Find the missing number in the given series 2, 6, 12, 20, 30, 42, 56, ?

Find the next term of the following number series : 10, 12, 16, 24, 40, ….

Find the missing number: 15,36,28 / 10,20,24 / 7,9,11 / 12,25,?