Answer:
Let
E1 and E2 are the event of getting a 5 and 6 and 1, 2, 3
or 4 on throwing a die respectively,
Let
A = event of getting exactly one head.
thrice,
S = {HHH, HHT, HTH, THH, HTT, THT, TTH, TTT}
Required
probability = P(E2/A)
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