A circle is divided into four sectors with numbers: 4, 9, 20, 43. What is the next number in the sequence (moving clockwise)?

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A 90
B 86
C 47
D 185

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Answer: A. 90

Each number is double the previous plus an increasing number: 4 × 2 + 1 = 9, 9 × 2 + 2 = 20, 20 × 2 + 3 = 43, so next is 43 × 2 + 4 = 90.

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A circle is divided into four sectors with numbers: 4, 9, 20, 43. What is the next number in the sequence (moving clockwise)?

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