Select the letter that will replace the question mark (?) in the given letter series.
 a, d, h, n, ?

Select theoption that is related to the fifth number in the same way as the second number is related to the first number and the fourth number is related to the third number.

13 : 195 :: 7 : 63 :: 18 : ?

In a certain code language, 'I know you' is written as 'Ha Hi He', 'I Like French' is written as 'Ho Hu Ha' and 'You like me' is written as 'He Ho Haa'. How will 'me' be written in that language?

In a certain code language, 'GREEN' is written as 'HTHIS' and ‘SAFFRON’ is written as ‘TCIJWUU’. How will 'WHITE' be written in that language?

Which of the following numbers will replace the question mark (?) in the given series?

7, 19, 4, ?, 1, 25

Select the number-pair that is analogous to the given pair.
 46 : 61

In a certain code language, if ‘raghav plays hockey’ is written as ‘xfjdni rzzmo ubghzs’, then ‘arun works hard’ will be written as:

Select the number triad that is analogous to the given triads.
 (64, 8, 65), (125, 27, 89)