9, 11, 33, 13, 15, 33, 17, ... choose which pair of numbers comes next?

Find out the wrong term: 445, 221, 109, 46, 25, 11, 4

U32, V29, __, X23, Y20. What number should fill the blank?

Find out the wrong term: 8, 14, 26, 48, 98, 194, 386

20, 20, 17, 17, 14, 14, 11, ... choose which pair of numbers comes next?

Which term of the series 5,10, 20, 40,...................is 1280 ?

Find the missing term: 4, 12, 36, 108, ?

Find the missing term: 125, 80, 45, 20, ?

Find the missing term: 36, 34, 30, 28, 24, ?