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What will come in place of question mark '?' in the following number series?
121, 117, 108, 92, 67, ?
121, 117, 108, 92, 67, ?
- A 31
- B 29
- C 41
- D 37
Answer not set
Discussion 1
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CCommunity
Let the missing number be x, then
121 – 117 = 4 = (2)2
117 – 108 = 9 = (3)2
108 – 92 = 16 = (4)2
92 – 67 = 25 = (5)2
67 – x = (6)2 = 36
⇒ x = 67 – 36 = 31
121 – 117 = 4 = (2)2
117 – 108 = 9 = (3)2
108 – 92 = 16 = (4)2
92 – 67 = 25 = (5)2
67 – x = (6)2 = 36
⇒ x = 67 – 36 = 31