alleryত্রিভুজাকার বিন্দুগুলির ধারাটি 1, 3, 6, 10, 15, 21, 28 এভাবে চলে। এর পরেরটিতে কতগুলি থাকবে?
A36
B38
C35
D34
Answer & Solution
Correct answer: A. 36
শেষ পার্থক্যটি ছিল 7, তাই পরবর্তী পার্থক্যটি হল 8 এবং 28 + 8 = 36।
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