1+3+6+10+15+…… ধারাটির সপ্তম পদ কত?
Solution
Correct Answer: Option D
1
1+2=3
3+3= 6
6+4= 10
10+5= 15
15+6= 21
21+7= 28
1+2=3
3+3= 6
6+4= 10
10+5= 15
15+6= 21
21+7= 28
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