Question

10+20+30+.......+70=?
what the total sum of this equation? Please Give answer step by step.​

Answer 1

Step-by-step explanation:

10+20+30+......+70=?

1st number (a)=10

last numer (l) = 70

difference (d) = 10

dinumber of terms of this series (n) = (a-l)/d + 1

= (70-10)/10 +1

= 60/10+1 = 6+1 = 7

sum of the series = n (a+l)/2

= 7(10+70)/2

• = 7×80/2
• = 7×40

= 280

I hope it will help you all the series