Jawabanmu

  • Pengguna Brainly
2014-03-25T07:22:37+07:00
3 kelereng (hitam) dan 4 kelereng putih
⇒ 2 putih dan 1 hitam
 \frac{4C2×3C1}{7C2}
==\frac{ \frac{4!}{2!(4-2)!} \frac{3!}{1!(3-1)!} }{ \frac{7!}{3!(7-3)!} } =\frac{ \frac{4!}{2!2!} \frac{3!}{1!2!} }{ \frac{7!}{3!4!} } =\frac{ \frac{24}{4} \frac{6}{2} }{ \frac{7654!}{3!4!} } =\frac{ 63 }{35}= \frac{18}{35}

⇒3 putih dan 0 hitam
= \frac{3C3}{7C3}= \frac{ \frac{3!}{3!(3-3)!} }{ \frac{7!}{3!(7-3)!} }= \frac{1}{35}

Total =  \frac{18}{35} +  \frac{1}{35} =  \frac{19}{35}