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Number series with increasing differences (+8 each step): find the missing term. Sequence given: 3, 15, ?, 63, 99, 143 Identify the first differences and continue the pattern to fill the blank. Choose the correct value.

Difficulty: Easy

Correct Answer: 35

Explanation:

First differences 15 − 3 = 12 (?) − 15 = 20 63 − (?) = 28 99 − 63 = 36 143 − 99 = 44

Pattern Differences increase by 8: 12, 20, 28, 36, 44, …

Compute 15 + 20 = 35; then 35 + 28 = 63, matching the series.

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