What should come in place of '?' in the given series? 23 32 42 53 65 78 ?
92
Find the difference between each pair of consecutive terms.
\(32 - 23 = 9\), \(42 - 32 = 10\), \(53 - 42 = 11\), \(65 - 53 = 12\), \(78 - 65 = 13\).
The differences increase by 1 each time: 9, 10, 11, 12, 13, so the next difference is 14.
Next term \(= 78 + 14 = 92\).
Hence, the missing number is 92.
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