Question

A two digit number is formed with digits 2.
3, 5, 7, 9 without repetition. What is the
probability that the number formed is
(1) an odd number? (2) a multiple of 5
7.​

Answer 1

Answer:

(1) an odd number:

2 digit number with odd number is (last digits 3,5,7 and 9)

therefore, 5×4=20

total outcomes=5×5=25

Probablity= 20/25=4/5

(2) a multiple of 5 and 7:

2 digit number with a multiple of 5 and 7 (last digits is 3,5,7,9) therefore 5×4=20

probablity=20/25=4/5