Which number continues the sequence? 7, 42, 9, 35, 11, 28, ...
Answer and explanation
Correct answer: C. 13
- Step 1: Two patterns alternate: +2 in the odd places and -7 in the even places. Step 2. The next number belongs to the first pattern: 11 + 2 = 13. Answer: 13. Why not the others: 21: the second pattern was continued instead of the first. 15: the step was added twice. 11: the step was subtracted.
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