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Choose a team of 6 students from 2 1 student to participate in the international mathematical olympiad. How many ways are there?
Choose a team of 6 students from 2 1 student to participate in the international mathematical olympiad.

C (2 1，6)=(2 1 * 20 * 19 * 18 * 17 * 16)/(6 * 5 * 4 * 3 * 2 * 65438+。

At least one student of A and B must be a member, c (19,4) = (19 *18 *17 *16)/(4 * 3 * 2 */kloc-0.

I wish you happiness.

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