Question
Find the next term in the series: 4, 9, 19, 39,
79, ?Solution
Observe differences: 9 − 4 = 5 19 − 9 = 10 39 − 19 = 20 79 − 39 = 40 Differences: 5, 10, 20, 40 → each term doubles. Next difference = 40 × 2 = 80 Next term = 79 + 80 = 159
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