What should come in place of the question mark '?' in the following number series? 61, 60, 63, 58, 65, ?
56
Look at the differences between consecutive terms: 60 − 61 = −1, 63 − 60 = +3, 58 − 63 = −5, 65 − 58 = +7.
The pattern of changes is −1, +3, −5, +7, …, where the signs alternate and the magnitudes are the odd numbers 1, 3, 5, 7, 9. The next change is therefore −9.
Applying it to the last term: \(65 - 9 = 56\).
Hence, the missing term is 56.
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