Question

Considre the formula s=n/2(a+l)
if a=2 , l=30 and n=15. find the value of s

Answer 1

Explanation:

`s = (n)/(2)(a+l) \\s = (15)/(2) (2+30)\\s = (15)/(2) X 32\\s = 15 X 16\\s = 240`

Answer 2

480

Explanation:

Using the formula s=n/2(a+l), where a is the first term, l is the last term, n is the number of terms, and s is the sum of the terms, we can substitute the given values and solve for s:

s = 15/2(2 + 30)

s = 15/2(32)

s = 15/64

s = 480

Therefore, the value of s is 480.