Question

5, 7, 23, 7, 9, 46, 9, 11.79

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Answer 1

Complete question:

Find the wrong term?

5, 7, 23, 7, 9, 46, 9, 11, 79

The wrong term in this series is 46.

• We have to find a pattern in the series to find the wrong term.
• The pattern of this series is as follows: first, divide the series into groups of three. The first group- 5, 7, 23. The second group- 7, 9, 46. The third group- 9, 11, 79.
• The get the third term of any group, we have to subtract the sum of the first two terms from their multiple.
• Third term = (First term × Second term) - (First term + Second term)
• For the first group (5, 7, 23), the third term = (5×7) - (5+7) = 35 - 12 = 23. The third term found and given are the same.
• For the second group (7, 9, 46), the third term = (7×9) - (7+9) = 63 - 16 = 47. 46 ≠ 47. The third term found (47) and given (46) are not the same. So the wrong term in this series is 46.
• For the third group (9, 11, 79), the third term = (9×11) - (9+11) = 99 - 20 = 79. The third found and given are the same.

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