1)Find the sum of the series: 5+7+9+10+13+13+17+16+---- upto 40 terms.
Answers
Answered by
2
n=40 a=5 d=2 we know sum =n÷2 (2a+(n-1)d) i.e. 20×10+78=800 so the answer is 800
Answered by
1
Sn=n/2(2a+(n-1))d
a=5,d=2,n=40.
a=5,d=2,n=40.
Similar questions