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Grade: 12
        
Sum of infinite series  1/9+1/18+1/30+1/45+1/63...
How do I solve the question
Kindly give a detailed solution
3 years ago

Answers : (1)

vivek
24 Points
							9  18  30   45   t(n)=an^2+bn+c  9    12   15      9=a+b+c ; 18=4a+2b+c;           3      3          30=9a+3b+ca=3/2,b=9/2,c=3    for ques t(n)=2/3(1/(n+1)(n+2)sum(1 - infinity)= 2/3 (1/n+1 -  1/n+2 )=2/3 (1/2) =1/3
						
3 years ago
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