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Probability - General Aptitude

Q1:

In a lottery, there are 10 prizes and 25 blanks. A lottery is drawn at random. What is the probability of getting a prize?

A
1
10

B
2
5

C
2
7

D
5
7

ANS:C -

2
7

P (getting a prize) = 10 = 10 = 2 .
(10 + 25) 35 7