Find the sum of all integers between 84 and 719, which are multiples of 5.
a = 85, d = 5, l = 715
n = 
+ 1
= 
+ 1
= 
= 127
S127= 
(a + l)
= 
(85 + 715)
= 
(800) = 50800
15
Find the sum of all integers between 84 and 719, which are multiples of 5.
a = 85, d = 5, l = 715
n = + 1
= + 1
= = 127
S127= (a + l)
= (85 + 715)
= (800) = 50800