allery1, 3, 6, 10, 15 টি বিন্দু দিয়ে ত্রিভুজ গঠন করা হয়। পরবর্তীটিতে কতগুলি বিন্দু থাকবে?
A28
B21
C24
D20
Answer & Solution
Correct answer: B. 21
পার্থক্যগুলি প্রতিবারে এক করে বৃদ্ধি পায় (2, 3, 4, 5), সুতরাং পরবর্তী পার্থক্য হলো 6 এবং 15 + 6 = 21।
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