alleryLabels 7, 12, 17, ..., 82 rise by 5; one is lost, leaving sum 660. Lost label?
A62
B47
C57
D52
Answer & Solution
Correct answer: D. 52
There are 16 labels totalling 16 × (7 + 82) ÷ 2 = 712, so the lost label is 712 − 660 = 52.
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