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What should come in place of the question mark (?) in the given series? 136 117 122 103 108 89 ?
108
94
70
84
94
Observe the two alternating patterns: a subtraction of 19 (-19) followed by an addition of 5 (+5).
Observe the two alternating patterns: a subtraction of 19 (-19) followed by an addition of 5 (+5).
Analyze consecutive differences
Calculate the difference between each term: 117-136 = -19, 122-117 = +5, 103-122 = -19, 108-103 = +5, 89-108 = -19.
Identify the logic
The series follows a repeating pattern of subtracting 19 then adding 5.
Calculate the final term
Applying the next step in the sequence: After the last operation (-19), we perform +5. Thus, 89 + 5 = 94.
A: 108 is a previous term in the series, not the result of the logic. C: 70 would be the result if we subtracted 19 again (89-19), ignoring the +5 pattern. D: 84 is a result of incorrect arithmetic (-5 instead of +5).
B is correct because the series follows a strict alternating pattern of subtracting 19 and adding 5, leading to 89 + 5 = 94.
If a series is neither purely increasing nor decreasing, always check for alternating operations or two interleaved sub-series.
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