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4.4
13 + 6 = 19 19 + 6 = 25. 19 X 6 = 114.
How about: 14 and 11
The numbers are -25, -23, -21 and -19.
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
19