What should come in place of the question mark (?) in the following number series. 12 12 18 45 180 1170 ?
What should come in place of the question mark (?) in the following number series.
12 12 18 45 180 1170 ?
(a) 13485 (b) 14675 (c) 15890 (d) 16756 (e) 12285
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(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× 4 = 180, [1.5 + 2.5 = 4]
180 × 6.5 = 1170, [2.5 + 4 = 6.5]
? = 1170 × 10.5 = 12285
Hence, 12285 will replace the question mark.
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