Question

Find the sum - 7+(-12)+-(17)+...+(-507)

Answer 1

Answer:

the answer of this question is -25957

Answer 2

Answer:

Step-by-step explanation:

Sum = n/2 (a+l)

where a = first item of series

l= last item of series

n= number of elements in the series

here, a= -7

l=-507

d=-12-(-7)=-5

now since l= a+(n-1)d

-507=-7+(n-1)(-5)

so n=101

Putting this in formula for sum,

sum= 101/2 (-7+ (-507))

sum= -25957