லேபிள்கள் 7, 12, 17, ..., 82 உயர்வு 5; ஒன்று தொலைந்து, தொகை 660. லேபிள் தொலைந்ததா?
A62
B47
C57
D52
Answer & Solution
Correct answer: D. 52
மொத்தம் 16 லேபிள்கள் 16 × (7 + 82) ÷ 2 = 712, எனவே இழந்த லேபிள் 712 - 660 = 52 ஆகும்.
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