QUIZ!!

~Math

– Kaidah Pencacahan

– Pecahan

___________________

– Soal Pertama

• Menentukan unsur ganda dan total unsur dari kata "Listrik"

• i = 2 huruf
• total huruf = 7 huruf

…

• Menentukan banyak susunan dari kata "Listrik"

P = n! ÷ k!

P = 7! ÷ 2!

P = (7 × 6 × 5 × 4 × 3 × 2 × 1) ÷ (2 × 1)

P = 5.040 ÷ 2

P = 2.520 susunan

• • •

– Soal Kedua

= 7/15 + 6/20 + 3/4

= (7 × 4)/(15 × 4) + (6 × 3)/(20 × 3) × (3 × 15)/(4 × 15)

= 28/60 + 18/60 – 45/60

= (28 + 18 – 45)/60

= (46 + 45)/60

= 1/60

Jawaban:

1. Banyak Susunan dari kata "Listrik"

L = 1

I = 2

S = 1

T = 1

R = 1

K = 1

Jumlah Huruf = 7

= 7!/2!

= 7×6×5×4×3×2×1/2×1

= 5.040/2

= 2.520

2.