alleryచుక్కలు 1, 3, 6, 10, 15 చుక్కలతో త్రిభుజాలను ఏర్పరుస్తాయి. తరువాతి త్రిభుజంలో ఎన్ని చుక్కలు ఉంటాయి?
A28
B21
C24
D20
Answer & Solution
Correct answer: B. 21
తేడాలు ప్రతిసారీ ఒకటి చొప్పున పెరుగుతాయి (2, 3, 4, 5), కాబట్టి తరువాతి తేడా 6 మరియు 15 + 6 = 21.
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