Question 1013654: A number sequence is as follows: 4, 8, 12, 16, 20, 24, .... If 4 is the 1st number in the sequence what is the sum of the first 300 numbers in the sequence?
Answer by fractalier(6550)   (Show Source):
You can put this solution on YOUR website! Couple of ways to do that...here's one way...
The sum of the first 300 integers: 1,2,3,4,5,... is found by
S = n(n+1)/2 = 300*301/2 = 45150
but since our sequence is four times that, that is, ours goes by 4,8,12,16,...,
we will merely multiply our answer by four and get
S = 4*45150 = 180600
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