Find out the number which should come at the place of question mark which will complete the following series: 5, 4, 9, 17, 35, ? = 139 (A) 149 (B) 79 (C) 49 (D) 69

Find out the number which should come at the place of question mark which will complete the following series: 5, 4, 9, 17, 35, ? = 139 (A) 149 (B) 79 (C) 49 (D) 69
by

1 Answer

Answer :

Answer: D

4 * 2 = 8 + 1 = 9

9 * 2 = 18 - 1=17

17 *2 = 34 + 1 =35

So 35 * 2 = 70 -1 = 69

Hence 4 + 5 + 9 + 17+ 35 + 69 =139 Twice the previous number plus 1 and

twice the previous and minus 1 series
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