What should come in place of the question mark (?) in the following number series? 18 38 120 ? 2480 14910 (a) 394 (b) 450 (c) 492 (d) 486 (e) None of these
Answered Feb 05, 2023
(c) The given number series is based on the following pattern:
18 × 2 + 2 × 1 = 38 38 × 3 + 3 × 2 = 120 120 × 4 + 4 × 3 = 492 492 × 5 + 5 × 4 = 2480 2480 × 6 + 6 × 5 = 14910 Hence, 492 will come in place of the question mark.
The series is as follows starting from the second number denote the previous number in the series by x. x × 1 + 1 × 7, x × 2 + 2...
The series is as follows starting from second number x × 1 + 12 , x × 2 + 22, x ×3 + 32, x × 4 + 42, x ×5...
(c) The series is as follows × 1 + 2, × 2 + 3, × 3 + 4, ...
(b) The series is as follows × 0.5 + 0.5, × 1 + 1, + 1.5 + 1.5, ....
(a) The series is as follows x2x1/3,x4x1/5,.......
(b) The pattern of the series is as follows × 12, × 22, × 32, × 42, × 52 Hence, required number = 1728.
(d) The pattern of the series is as follows : 8 × 2.5 = 20 20 × 2.5 = 50 50 × 2.5 = 125 ? = 125 × 2.5 = 312.5
(b) The given number series is based on the following pattern: 12 × 0.5 + 0.5 = 6.5 6.5 × 1 + 1 = 7.5 7.5 × 1.5 + 1.5 = 12.75 12.75 ×...
(e) The pattern of series is as follows : 12 × 1 = 12, 12 × 1.5 = 18, [0.5 + 1 = 1.5] 18 × 2.5 = 45, [1+ 1.5 = 2.5] 45×...
(c) Note that 0 = 13 – 1 6 = 23 – 2 24 = 33 – 3
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