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In the following number series, a wrong number is given. Find out the wrong number.

312, 320, 311, 436, 389, 1718


1. 436
2. 1718
3. 311
4. 312
5. 389

1 Answer

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Best answer
Correct Answer - Option 5 : 389

Given:

312, 320, 311, 436, 389, 1718

Calculation:

Considering the above series, the logic should be

320 - 312 = 8 = (2)3

311 - 320 = -9 = -(3)2

436 - 311 = 125= (5)3

387 - 436 = -49 = -(7)2

1718 - 387 = 1331 = (11)3

After observing the logic we can say the wrong term is 389.

∴ The wrong term in this series is 389.

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