SAT Math Multiple Choice Question 634: Answer and Explanation

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Question: 634

4. 7, 12, 22, 42, 82

Which of the following gives a rule for finding each term in the sequence after the first?

  • A. Add 5 to the preceding number.
  • B. Add 5 to the sum of all of the preceding terms.
  • C. Double the preceding term and then subtract 2 from the result.
  • D. Add 14 to the preceding term and divide that result by 2.

Correct Answer: C

Explanation:

C

Advanced Mathematics (functions and sequences) EASY

Notice that the rule in choice (C) generates the entire sequence: 7 (times 2 minus 2 equals) 12 (times 2 minus 2 equals) 22 (times 2 minus 2 equals) 42 (times 2 minus 2 equals) 82.

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