Verbal Reasoning - Mental Ability Questions

In the following question, select the missing number from the given series.

5, 8, 11, 14, 17, ?

Select the word which cannot be formed using the letters of the given word

REJUVENATION

Thrice the square of a natural number decreased by 4 times the number is equal to 50 more than the number. The number is  ?

Frugal : Parsimonious :: ?

In the following question, select the missing number from the given series.

9, 16, 13, 12, 17, 8, ?, ?

In the following question, select the missing number from the given series.

1, 2, 4, 7, 11, ?

Use the following passage for the questions based on it.

There are 6 flats on a floor in two rows. Out of these, three are north facing and the other three are south facing flats. The flats are to be allotted amongst Arun, Biswajyot, Chitra, Derek, Evan, and Fatima. Biswajyot gets a north facing flat and is not next to Derek. Derek and Fatima get diagonally opposite flats. Chitra is next to Fatima, and gets a south facing flat. Evan gets a north facing flat.

Except Derek and Fatima, which other pair is diagonally opposite to each other?

In the following question, select the missing number from the given series.

10, 12, 14, 16, 18, ?