C. Dlaci
7. There are 20 cards in a box numbered from 1 to 20. When a card is picked randomly from
the box, what is the probability that it has a number which is
a. prime number
b. factor of 15
c. multiple of 4
Answers
Answered by
1
Answer:
a.9/20
b.1/5
c.3/20
step by step:
a) prime numbers between 1 to 20 are 1,2,3,5,7,11,13,17,19 = 9
p( prime no.) = 9/20
b) factors of 15 between 1 to 20 are 1,3,5,15 = 4
p( factor of 15) = 4/20 = 1/5
c) multiple of 4 between 1 to 20 are 4,8,12= 3
p( e ) = 3/20
please mark me as brilliant
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