Question

36. Find out the wrong number in the series: 8,9,21,39,79,140,204​

Answer 1

Answer:

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Answer 2

The wrong in the series 8, 9, 21, 39, 79, 140, 204 is 79.

Step-by-step explanation:

• Here, the given numbers are 8, 9, 21, 39, 79, 140 and 204.

• If we try to find a pattern in these given numbers, we may fail to find the odd one quickly.

• However let us check if the numbers are primes and non-primes. This may help us to reach our answer sooner. We can do this by prime factorization.

1. 8 = 2 × 2 × 2
2. 9 = 3 × 3
3. 21 = 3 × 7
4. 39 = 3 × 13
5. 79 = 1 × 79
6. 140 = 2 × 2 × 5 × 7
7. 204 = 2 × 2 × 3 × 17

• We can see that, 79 is the only prime number and thus the unsuitable number in the given series os 79.