The letters are in alphabetical order. The numbers increase by two.

The letters move 2, 2, 3, 3, 4, 4, ... steps forward.

In this series, the third letter is repeated as the first letter of the next segment. The middle letter, A, remains static. The third letters are in alphabetical order, beginning with R.

The given number series follows a pattern that,

$$\begin{gathered} 19 + 1 2 = 20 ( not 21 ) \\ 20 + 2 2 = 24 \\ 24 + 3 2 = 33 \\ 33 + 4 2 = 49 \\ 49 + 5 2 = 74 \end{gathered}$$

Hence, the odd number in the given number series is 21.

The given number series is 8, 14, 24, 40, ? .

It follows a pattern that,

8

8 x 1.5 + 2 = 14

14 x 1.5 + 3 = 24

24 x 1.5 + 4 = 40

40 x 1.5 + 5 = 65

Hence, the next number in the given number series is 65.

Her the given number series is 11, 17, 39, 85, ?

$$\begin{gathered} 11 \\ 11 + 3 2 - 3 = 17 \\ 17 + ( 5 2 - 3 ) = 39 \\ 39 + ( 7 2 - 3 ) = 85 \\ 85 + ( 9 2 - 3 ) = 163 \end{gathered}$$

Hence, the next number in the given sequence is 163.

The given number sequence is 101, 98, 93, 86, 75, ?

101

101 - 3 = 98

98 - 5 = 93

93 - 7 = 86

86 - 11 = 75

75 - 13 = 62

Here the series follows a pattern that consecutive subtraction of prime numbers.

Hence, the next number in the sequence is 62.

The given sequence is a combination of two series
1)31,35,39,43,47
2) 45,47,49,51,53
So,the missing term is 49

The correct pattern is +4,+7,+10,+13,+16
So, 36 is wrong term and it must be replaced by 25+13=38