Find the missing term.

1, 6, 15, ?, 45, 66, 91

Which option will replace the question mark in the given series:

BB0, EC2, HE3, KG4, NK3, ?

Find out the wrong number in the sequence:

40960, 10240, 2560, 640, 200, 40, 10

In the letter series, some of the letters are missing, which are given in the alternatives (A), (B), (C) and (D).

m n o n o p q o p q r _ _ _ _ s t u

(A) r

(B) s

(C) q

(D) p

Choose the correct sequence from the options given below:

Complete the series: 20, 24, 30, 32, 38, 42,__________.

In a flower bed there are 23 rose plants in the first row, 21 in the second, 19 in the third and so on. There are 5 rose plants in the last row. Then the number of rows in the flower bed is:

Find the missing number from the given alternatives.