Question: The month in which the year's highest temperature occurs in a city has probabilities in the ratio 1:3:6:10 for May, June, July, and August, respectively.

The month in which the year's highest temperature occurs in a city has probabilities in the ratio 1:3:6:10 for May, June, July, and August, respectively. Find the probability that the highest temperature occurs in either May or June.

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