IBPS RRB PO Prelims 12 sep 2020 - Category wise Question and Answer Practice Test with Solutions & PDF
IBPS RRB PO PRACTICE TEST [1 - EXERCISES]
IBPS RRB PO Prelims 12 sep 2020
Directions:
What should come in place of the question mark '?' in the following number series?
Question : 44 [IBPS-RRB-PO-Prelims-2020]
121, 123, 118, 128, ?, 137
a) 111
b) 115
c) 100
d) 105
e) 123
Answer »Answer: (a)
The pattern of the series is:
121 + 2 = 123
123 – (2 + 3) = 118
118 + (2 + 3 + 5) = 128
128 – (2 + 3 + 5 + 7) = 111
111 + (2 + 3 + 5 + 7 + 9) = 137
Hence, the answer is A.
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