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लेबल 7, 12, 17, ..., 82 वृद्धि 5; एक खो गया है, योग 660 छोड़कर। लेबल खो गया?

A62
B47
C57
D52
Answer & Solution
Correct answer: D. 52
16 लेबल हैं जिनका कुल योग 16 × (7 + 82) ÷ 2 = 712 है, इसलिए खोया हुआ लेबल 712 − 660 = 52.
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