Out of $7$ consonants and $4$ vowels, how many words of $3$ consonants and $2$ vowels can be formed?

What value will come in place of question mark (?) in the number series given below?

$8 15 29 57 113 ?$

What value will come in place of question mark (?) in the number series given below?

$16 28 52 100 196 ?$

What value will come in place of question mark ($?$) in the number series given below?

$99, 90, 82, 75, 69 ?$

What value will come in place of question mark ($?$) in the number series given below?

$5, 7.5, 15, 37.5, ?$

Insert the missing number.

$12, 25, 49, 99, 197, 395, (..)$