Question 1125588
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I will answer question A)  only.


<pre>
     {{{C[8]^4*(1/2)^4*(1/2)^4}}} = {{{((8*7*6*5)/(1*2*3*4))*(1/2)^8}}} = {{{70/2^8}}} = 0.2734 = 27.34%  (approximately).
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