What is the sum of the multiples of 4 between 19 and 130 inclusive?
What is the sum of the multiples of 4 between 19 and 130 inclusive?
Answer/Solution
2072
Steps/Work
the fastest way in an AP is to find the average and multiply with total integers..
between 19 and 130, the smallest multiple of 4 is 20 and largest =128..
average=(20+128)/2=148/2=74.
total numbers = (128-20)/4 + 1= 27+1=28..
sum=28*74=2072
ans D
between 19 and 130, the smallest multiple of 4 is 20 and largest =128..
average=(20+128)/2=148/2=74.
total numbers = (128-20)/4 + 1= 27+1=28..
sum=28*74=2072
ans D