Question
What should come in place of the question mark (?) in
the given series? 153, 166, 159, 185, 171, ?Solution
ATQ,
Step-by-step differences: 166 − 153 = +13 159 − 166 = −7 185 − 159 = +26 171 − 185 = −14 So, the pattern of differences is: +13, −7, +26, −14, ? Observe the pattern: Positive jumps: +13 → +26 → next: +39 (adds 13 each time) Negative jumps: −7 → −14 → next would be −21 (adds 7 each time in magnitude) Since the last difference was −14, next must be +39 So, 171 + 39 = 210
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