There are eight pairs of numbers divisible by three that sum to 150, and 75 is also divisible by three, so:
sum = 17 * 75 = 750 + 525 = 1275
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100
Sum of first n natural numbers is (n) x (n + 1)/2 Here we have the sum = 100 x (101)/2 = 50 x 101 = 5050
The sum of the first 50 whole numbers is 1,225.
Sum of 1st n even numbers: count*average = n * (2 + 2*n)/2 = n * (n+1) Sum = 50 * (2+100)/2 = 50*51 = 2550
The factors of 100 are: 1, 2, 4, 5,10, 20,25, 50, 100But all of these are not divisible in 120.The following are common to both: 1,2,4,5,10,20.