Which term of the series 5+8+11+14+... is 302 ? 

A    55  

B   72 

C   100 

D 105 

Solution

Correct Answer: Option C

ধারাটির ১ম পদ, a = 5, সাধারণ অন্তর, d = 8-5 = 3 

মনেকরি, r-তম পদ = 302 

 a + (r-1)d =302 

⇒ 5+(r-1).3=302 
⇒ 5+3r - 3 = 302
⇒ 3r = 302-5+3
⇒ r = 100 

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