Multiples are not 5, 10, 15 20, 25. WRONG! It means like 1. Because, 1x25= 25. Therefore it is a multiple. 2x nothing= 25. 5x5= 25 MULTIPLE!
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Sum of first 25 multiples of 44+8+12....100taking 4 common4(1+2+3+4....+25) = 4*325 =1300
The sum of the first 25 numbers is 25*26/2 = 325 So the sum of the first 25 multiples of 12 is 325*12 = 3900
the multiples of 4 are 4,8,12,16,20,24,28,32,36,40,44,48,52,56,60 those are the multiples of 4
12, 24, and 36
4, 8 and 12 are the first 3 common multiples of 2 and 4