CTET 2 Math and Science Sep 2015 Paper

Question : 31 of 120

Marks: +1, -0

Natural numbers 4 to 15 are written on different slips (one number on one slip), kept in a box and mixed well. Renu picks up one slip from the box without looking into it. What is the probability that this slip bears a prime number ?

3 /11
1 /3
5 /12
2 /5

Validate

Solution:

Total prime number from 4 to 15=4 (5,7,11 and 13)
Total number from 4 to 15=12
Required Probability

=4/12=1/3

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