Progressive Pre-Employment Assessment Practice Test

What is the next number in the sequence 3, 8, 18, 38,...?

68 88 98 78

Correct Answer:

Explanation:

Look at how the sequence grows by the amount added each step. The differences between consecutive terms are 5, 10, and 20, which are doubling each time. If that pattern continues, the next difference should be 40. Adding 40 to 38 gives 78, so the next number is 78. The other options would require adding amounts that don’t follow the doubling pattern (for example, 38 + 30 = 68, 38 + 50 = 88, 38 + 60 = 98), so they don’t fit the established rule.

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