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Number and Letter Series

Find next/missing/wrong term in a series.

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Q1 · Number and Letter Series · EASY
Find the next term in the series: 3, 6, 12, 24, 48, ?
Q2 · Number and Letter Series · EASY
Find the missing term in the series: 5, 10, 20, ?, 80, 160
Q3 · Number and Letter Series · MEDIUM
Find the next term in the letter series: B, E, H, K, N, ?
Q4 · Number and Letter Series · MEDIUM
Find the wrong term in the series: 2, 6, 12, 20, 30, 42, 58
Q5 · Number and Letter Series · HARD
Find the next term in the series: 1, 4, 9, 18, 35, 68, ?