1.

Two numbers a and b are selected at random from the set of first 10 natural numbers. Then the probability that f(x)=x3−15x2+72x+8 monotonically increases in the interval [a,b], is equal to

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Two numbers a and b are selected at random from the set of first 10 natural numbers. Then the probability that f(x)=x315x2+72x+8 monotonically increases in the interval [a,b], is equal to



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