Discussion
15, 8, 19, 12, 23, 16, ? What will come at the question mark?
Answer: D
The next number is 27. The series is made up of two alternating series. The terms in the first, third and fifth places are 15, 19 and 23, which go up by 4, so the next in that series is 27. The terms in the second, fourth and sixth places are 8, 12 and 16, also up by 4. The question mark falls at the seventh place, which belongs to the first series, so it is \(23 + 4 = 27\). The options 35, 40 and 45 are far from the pattern, and 20 would be the next term of the second series.
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