Answer:
125172
Step-by-step explanation:
13 + 14 +15 +16 +...+500
= ( 13 + 500 ) + ( ( 13 + 1 ) + ( 500 - 1 ) ) + ( ( 13 + 2 ) + ( 500 - 2 ) )+....
= (13 + 500) + (14 + 499) + ( 15 + 498) +.....
= 513 + 513 + 513 +......
= 513 * n
to calculate the value of n
(500 - 13 )= 487 +1 =488
thus n = 488 /2 = 244
so the answer is 513 * 244 = 125172
sum up :
if u see the question , Sum the integers a to b
the answer is (a+b)×(a-b+1)÷2
