In testing a certain kind of truck tire over a rugged terrain, it is found that 25%

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In testing a certain kind of truck tire over a rugged terrain, it is found that 25% of the trucks fail to complete the test run without a blowout. Of the next 15 trucks tested, find the probability that

(a) From 3 to 6 have blowouts;

(b) Fewer than 4 have blowouts:

(c) More than 5 have blowouts.

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