Verbal Reasoning - Mental Ability Questions

Which of the following terms follows the trend of the given list?

QRPQPQPQP, QPRQPQPQP, QPQRPQPQP, QPQPRQPQP, QPQPQRPQP, _______________.

Select the related word/letters/number from the given alternatives.

534 : 645 : : 381 : ?

Select the related word/letters/number from the given alternatives.

17 : 493 : : ? : 551

Select the related word/letters/number from the given alternatives.

96 : 54 : : 89 : ?

Select the related word/letters/numbers from the given alternatives:

12:20::30: ?

If 18$6 = 6, 8$2 = 3 and 8$4 = 2, then find the value of 18$12 = ?

Select the related word/letters/number from the given alternatives.

1331 : 11:: 13824 : ?

Which of the following terms follows the trend of the given list?

YXXXXXX, YYXXXXX, YYYXXXX, YYYYXXX, YYYYYXX, _______________.