Answer:
3/5.
6/25
2/5.
Step-by-step explanation:
1. Prob(An odd number is drawn) = 25/50 = 1/2 (as a half of the numbers 1 - 50 are odd).
Prob (factor of 10 is drawn) = 5/50 = 1/10. (10,20,30,40,50 are the factors).)
So Prob(odd or factor of 10 is drawn) = 1/2 + 1/10 = 6/10
= 3/5.
2. Square numbers are 1, 4, 9, 16, 25, 36 and 49. Probability = 7/50.
Factors of 8 are, 8, 16, 24, 32, 40, 48 .
we do not count 16 in our calculations because it is a square number and has been counted already so probability = 5/50
So the required probability = 7/50 + 5/50 = 12/50 = 6/25.
3. Multiples of 4 are 4, 8, 12, 16 , 20, 24, 28, 32, 36, 40, 44, 48. (12 numbers).
Probability of a multiple of 4 = 12/50.
Multiples of 5 are 5, 10, 15 , 20, 25, 30, 35, 40 , 45 , 50.
We don't count 20 or 40 as they are multiples of 4 so
Prob(multiple of 5) = 8/50
Required probability = 8/50 + 12/50 = 20/50
= 2/5.
