A number is selected at random from the first 30 natural numbers. What is the probability that the number is a multiple of either 4 or 15?
Choices
A) 17/30  B) 2/5  C) 3/10  D) 4/15  E) 11/30
Number of Multiples of 4 from 1 through 30 = 30/4 = 7   Number of Multiples of 15 from 1 through 30 = 30/15= 
<gadget id="calculator">30/15</gadget>
<output>2</output>
2   Number of Multiples of 4 and 15 both from 1 through 30= Number of Multiples of 15*4(=60) = 0   Total favourable cases = 7 + 2 - 0= 
<gadget id="calculator">7 + 2 - 0</gadget>
<output>9</output>
9   Probability= 9 / 30 = 3/10   Answer: option 3/10
<result>C</result>
A number is selected at random from the first 30 natural numbers. What is the probability that the number is a multiple of either 4 or 15?