Question

If 20 dates are named at random what is the probability that 3 of them will be sundays

Answer 1

probability of 1 Sunday = 1/20
so, probability of 3 Sunday's = 3/20
I hope it will help u

Answer 2

Answer:

p(A) = 20C₃ *6¹⁷/ 7²⁰

Step-by-step explanation:

  1 week = 7 days  ---> sunday

20 - 3 = 17

20C₃ * 6¹⁷

p(A) = n(A)/ n(s)

n(A) = 20C₃ *6¹⁷

n(s) = 7²⁰

p(A) = 20C₃ *6¹⁷/ 7²⁰