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In the following series one number is wrong, Find out the wrong number.
5, 4, 7, 20, 79, 395, 2363
5, 4, 7, 20, 79, 395, 2363
- A4
- B7
- C79
- D395
Answer not set
Discussion 1
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CCommunity
The pattern is as follows:
⇒ 5 × 1 – 1 = 4
⇒ 4 × 2 – 1 = 7
⇒ 7 × 3 – 1 = 20
⇒ 20 × 4 – 1 = 79
⇒ 79 × 5 – 1 = 394
⇒ 394 × 6 – 1 = 2373
∴ 395 is wrong and should be replaced by 394.
⇒ 5 × 1 – 1 = 4
⇒ 4 × 2 – 1 = 7
⇒ 7 × 3 – 1 = 20
⇒ 20 × 4 – 1 = 79
⇒ 79 × 5 – 1 = 394
⇒ 394 × 6 – 1 = 2373
∴ 395 is wrong and should be replaced by 394.