Find the sum of all integers between 84 and 719, which are multiples of 5
given an AP is required of all integers between 84 and 719, which are multiples of 5
To find: the sum of all integers between 84 and 719, which are multiples of 5
So, the sequence is 85, 90, 95….715
It is an AP whose first term is 85 and d is 5
Hence the sum is given by the formula
Now for the finding number of terms, the formula is
n = 127
Substituting n is the sum formula we get
s = 50800