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      Question

      What should come in place of the question mark (?) in

      the given series? 153, 166, 159, 185, 171, ?
      A 194 Correct Answer Incorrect Answer
      B 185 Correct Answer Incorrect Answer
      C 210 Correct Answer Incorrect Answer
      D 214 Correct Answer Incorrect Answer

      Solution

      ATQ,

      Step-by-step differences: 166 βˆ’ 153 = +13 159 βˆ’ 166 = βˆ’7 185 βˆ’ 159 = +26 171 βˆ’ 185 = βˆ’14 So, the pattern of differences is: +13, βˆ’7, +26, βˆ’14, ? Observe the pattern: Positive jumps: +13 β†’ +26 β†’ next: +39 (adds 13 each time) Negative jumps: βˆ’7 β†’ βˆ’14 β†’ next would be βˆ’21 (adds 7 each time in magnitude) Since the last difference was βˆ’14, next must be +39 So, 171 + 39 = 210

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