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A consistent rule produced every one of the numbers below. Discover the pattern and state the value the question mark conceals.
1, 64, 10, 56, 19, 48, ?

  • A.37
  • B.36
  • C.21
  • D.28

Answer: B

Correct answer: 28

Two series have been laid down alternately. The terms in the odd positions are 1, 10, 19, which rise steadily, and those in the even positions are 64, 56, 48, which fall. The missing term continues the first of these, giving 28. As a check, the answer differs from the term two places before it by 9, which is the step that strand has taken throughout. Options that are not of the right order of magnitude can be discarded before the rule is even settled.

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