Question

Dari 10 lembar undian terdapat 2 lembar undian mendapat hadiah.
jika erlin membeli 1 lembar , berapakah peluang mendapatkan hadiah?

Answer 1

N(S)
10C2 = 10!/8! . 2!
= 90/2 = 45
n(A)
10C1 = 10!/9! . 1!
= 10/1 = 10
p(A) = n(A)/n(S)
= 10/45 = 2/9
*Kalautidaksalah