In a school, four out of five students have calculators.If two students are picked at random,what is the probability that a) both have a calculator b) only one has a calculator

Answer 1

prob(calc) = 4/5
prob(no calc) = 1/5

prob(2 of 2 having calc) = (4/5)^2 = ..
prob(1of2 have calc) = (4/5)(1/5) + (1/5)(4/5) = ...

Answer 2

thank you

Answer 3

please can you explain further

Answer 4

At a school with a large number of students, 4 out of every 5 students own a calculator.
a. What is the probability that a student selected at random does not own a calculator?
b. What is the probability that two students selected at random do not own a calculator?