Identify the missing term in the sequence: $23, - -, 31, 35, 39$

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None of the above.

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Solution

The correct option is C 27
The numbers $31, 35, 39$ are in an arithmetic sequence, where the difference between two consecutive terms is $4.$
$∴$ The term previous to $31$ is $31 - 4 = 27$
Also, $23 + 4 = 27$

Hence, the sequence is $23, 27, 31, 35, 39.$

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