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Hi Nicole and David -- please ignore this request. Found later the parentheticals were shorthand for another another formula that requires factorials. Essentially the (10/6) should be 10!/(10-6)!(6!). Worked perfectly after making the substitution. Thanks!

Updated by Nicole to add: This is regarding P1.T1.QA-1 Chapter 1 Probability Appears to be an error on page 21 of the VitalSource books. The Bernouli distribution doesn't calc to 14.6%. That or either I'm wrong (equally possible).