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If 5+3+2=151022, 9+2+4=183652, then 7+2+5=?

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In ahorse racing competition there were 18 numbered 1 to 18.The organizers assigned a probability of winning the race to each horse baesd on horses health and training the probability that horse one would win is 1/7, that 2 would win is 1/8, and that 3 would win is 1/7.Assuming that tie is imposible Find the chance that one of these three will win the race? If f(1)=4 and f(x+y)=f(x)+f(y)+7xy+4, then f(2)+f(5)=?