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  • A test consists of 6 multiple choice questions, each having 4 alternative answer of which only is correct. The number of ways, in which a candidate answers all six questions such that exactly four of the answers are correct, is____________ <stro

A test consists of 6 multiple choice questions, each having 4 alternative answer of which only is correct. The number of ways, in which a candidate answers all six questions such that exactly four of the answers are correct, is____________
Option: 1 95
Option: 2 135
Option: 3 105
Option: 4 120

Answers (1)

best_answer

\begin{array}{l} \text {Number of Ways }={ }^{6} \mathrm{C}_{4} \cdot 1^{4} \cdot 3^{2} \\ =15 \times 9 \\ =135 \end{array}

Posted by

himanshu.meshram

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