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In the following number series, a wrong number is given. Find out the wrong number.
330, 80, 280, 120, 250, 130, 240
330, 80, 280, 120, 250, 130, 240
- A330
- B280
- C250
- D130
Answer not set
Discussion 1
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CCommunity
330 – 80 = 250
⇒ 280 – 80 = 200
⇒ 280 – 120 = 160
⇒ 250 – 120 = 130
⇒ 250 – 140 = 110 (not 130)
⇒ 240 – 140 = 100
(250 – 200 = 50, 200 – 160 = 40, 160 – 130 = 30, 130 – 110 = 20, 110 – 100 = 10)
∴ Wrong number in series = 130
⇒ 280 – 80 = 200
⇒ 280 – 120 = 160
⇒ 250 – 120 = 130
⇒ 250 – 140 = 110 (not 130)
⇒ 240 – 140 = 100
(250 – 200 = 50, 200 – 160 = 40, 160 – 130 = 30, 130 – 110 = 20, 110 – 100 = 10)
∴ Wrong number in series = 130