There are 20 members on a football squad. In electing a caption and a co-captain, how many different outcomes of the election is possible ?
Correct Answer: Option C
যেহেতু ২০ জনের থেকে অধিনায়ক ও সহ-অধিনয়াক অর্থাৎ মোট ২ জন নিতে হবে, তাই সূত্রটি হবে
\(^{20}{C_{2\;}} = \frac{{20!}}{{2!\left( {20 - 2} \right)!}} = \frac{{20.19.18!}}{{2.18!}} = \frac{{20.19}}{{2.}} = 10 \times 19 = 190\)
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