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In a multiple-choice test there are 6 questions.

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In a multiple-choice test there are 6 questions. 4 alternatives answers are given for each question by choosing one answer for each question, then the number of ways to get exactly 4 correct answers is
(A) 4^6-4^2;
(B) 135;
(C) 9;
(D) 120.

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answer is b

6C4*1*3*3= 135

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