Question:a+(a+d)+(a+2d)+.....ধারাটির দশম পদ কোনটি ? 

A a+10d 
B a+9d 
C 10a+d 
D 9a+d 

+ Answer
B 

+ Explanation
n তম পদ =a+(n-1)d     10 তম পদ=a+(10-1) d=a+9d.

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sahana pervin

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