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What should come in place of the question mark ‘?’ in the given series? 81, 84, 90, 99, 111, ?

If + means −, − means ×, × means ÷, ÷ means +, then what will come in place of the question mark (?) in the following equation? 17 ÷ 63 − 3 + 84 × 12 = ?

If 'P' stands for '÷', 'Q' stands for 'x', 'R' stands for '+' and 'S' stands for '-', then the resultant of which of the following would be 14?

KL 15 is related to NO 21 in a certain way. In the same way, XY 28 is related to AB 34. Which of the following is related to GH 41 by using the same logic?