alleryবিন্দুবোৰে 1, 3, 6, 10, 15 টা বিন্দুৰে ত্ৰিভুজ গঠন কৰিছে। পৰৱৰ্তীটোত কিমানটা বিন্দু থাকিব?
A28
B21
C24
D20
Answer & Solution
Correct answer: B. 21
পাৰ্থক্যবোৰ প্ৰতিবাৰে একো একোকৈ বাঢ়ি গৈছে (2, 3, 4, 5), গতিকে পিছৰ পাৰ্থক্যটো হ'ব 6 আৰু 15 + 6 = 21।
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