Question 292711
The probability of getting a wrong answer on any particular question is 3/4. Since incorrectly anwering any question is independent of the others we can use the formula that says the probablity of two (or more) events, A and B is equal to the probability of A times the probability of B ( that is, P(A and B) = P(A) * P(B) ). In this case we have:

Probability for ten wrong answers is (3/4)*(3/4)*...*(3/4) for ten factors or equivalently (3/4)^10.