Gọi số người ít nhất là `a (a ∈ NN)`
`=> a = BCNNNN(3 , 5)`
Ta có:
`3` và `5` là đôi một nguyên tố cùng nhau
`=> BCNNNN(3,5) = 3.5 = 15`
`=> a = 15`
Vậy số người ít nhất là `15`
Đáp án:
15
Cach giai: Vi nhom co the tach ra lam nhom 3 nguoi hoac nhom 5 nguoi => so nguoi trong nhom nhay chia het cho 3 va 5 => nhom nhay it nhat co 15 nguoi
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