Answers

2016-07-01T10:32:18+08:00
First find the sum of all even integers between 1 and 101 thus 2,4,6,...100.
this will be twice the sum of 1 to 50 thus 2*50*51/2 = 50*51 = 5220
next find the sum of all numbers divisible by 5 and 2 between 1 and 101 thus 10, 20,...100
this will be 10 times the sum of 1 to 10
this is 10*10*11/2 = 550
thus the sum of all even numbers between 1 to 101 and not divisible by 5 is 2550 - 550 = 2000
0