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Verified answer
Jamaah laki-laki=15Sn=1/2 n(n-1)
=1/2 . 15(15-1)
=1/2 . 15(14)
=1/2 . 210=105
Jamaah perempuan =5
Sn=1/2 n(n-1)
=1/2 . 5(5-1)
=1/2 .5(4)
=1/2 . 20=10
*Jika semuanya berjabat tangan =20
Sn=1/2 n(n-1)
=1/2 . 20(20-1)
=1/2 . 20(19)
=1/2. 380
=190
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Verified answer
Bab Pola BilanganMatematika SMP Kelas VII
banyak jabat tangan = 1/2 x n x (n - 1)
jamaah laki-laki = 15 orang
banyak jabat tangan = 1/2 x 15 x 14
banyak jabat tangan = 105 kali
jamaah perempuan = 5 orang
banyak jabat tangan = 1/2 x 5 x 4
banyak jabat tangan = 10 kali
jika semuanya berjabat tangan → semua ada 20 orang
banyak jabat tangan = 1/2 x 20 x 19
banyak jabat tangan = 190 kali