Discussion
Every term here follows from the one before it, or from its own position. Work out the rule and supply the missing number.
150, 136, 122, 108, ?
Answer: D
Correct answer: 94
Every gap is the same: the differences run -14, -14, -14, so the common difference is -14. Applying it once more to the final term, 108 - 14 gives 94. As a check, subtracting -14 from the answer returns 108, the term before it, and repeating that recovers the whole series. Once the difference is known the series can be extended in either direction, and checking backwards to the first term is a quick way to confirm it.
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