In the following letter series, some of the letters are missing which are given in that order as one of the alternatives below it. Choose the correct alternative.

__ bc __ ca __ abc __ c __ ca

Direction: In the following letter series, some of the letters are missing which are given in that order as one of the alternatives below it. Choose the correct alternative.

ab __ aa __ bbb __ aaa __ bbba

Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.

$3, 9, 27, 81, 243, ?$

Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.

$1, 6, 12, 19, 27 ?$

Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.

$125, 80, 45, 20, ?$

Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.

$120, 99, 80, 63, 48, ?$

Choose the correct alternative that will continue the same pattern and replace the question mark in the given series.

$589654237, 89654237, 8965423, 965423, ?$

In each series given below, what would come in place of the question-mark?

2B, 4C, 8E, 14H, ?

In each series given below, what would come in place of the question-mark?

C(l)L, F(4)O, I(9)R, L(16)U,?