5) A coin is tossed four times. Let A = event at least two Tails is tossed, B = the Number of tails is ODD.  We identify A = ( THTH, HHTT, HTHT, HTTH, THHT, TTHH, HTTT, THTT, TTHT, TTTH) B = (THHH, HHTH, HHHT, HTHH, HTTT, THTT, TTHT, TTTH) Write the elements in : a) AnB = b) A’ = c) A u B = d) P(A) =  e) P(An B) =   f) P(A u B) =

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A:

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A: One professor grades homework by randomly choosing 5 out of 12 homework problem to grade.n=12r=5