নিম্নের ধারাটির দশম পদ কত? ১, ৩, ৬, ১০,১৫,২১.....
A. ৪৫
B. ৫৫
C. ৬২
D. ৭২
সঠিক উত্তরঃ
B.
৫৫
Explanation:
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