Mathematics, 24.07.2021 17:10 1tzM3

Ñoäi vaên ngheä cuûa tröôøng coù 10 nam vaø 5 nöõ. Hoûi coù bao nhieâu caùch choïn ra 5 ngöôøi ñeå tham gia bieåu dieãn vaên ngheä; bieát:
a) Nhaát thieát phaûi coù ít nhaát 1 nam vaø 1 nöõ.
b) Coù ñuùng 2 nam, 3 nöõ vaø moät baïn nam ñöôïc choïn laøm nhoùm tröôûng.
c) Coù ñuùng 3 nam, 2 nöõ vaø baïn Huøng ñöôïc choïn laøm nhoùm tröôûng.

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