Find the following sums 5+10+15+20+ ..........+100 *
Answers
Answered by
2
Answer:
Step-by-step explanation:
5+10+15...+100
=> (5+100) + (10 +95) + ——— (45 + 60) + (50 +55)
=> 105 + 105 —— (10 times)
=> 1050
Answered by
2
a=5
l=100
d=10-5=5
n=?
Sn=?
l=a+(n-1)d
100=5+(n-1)5
95=5n-5
100=5n
n=20
Sn=n/2[a+l]
Sn=10[5+100]
Sn=105(10)
Sn=1050
Similar questions