a number is perfect if it is equal to the sum of all its proper divisors (i.e. excluding itself ) we roll two standard 6 sided dice. what is the probability that the product of numbers that appear on the two faces is a perfect number?
a.5/36
b.1/9
c.1/12
d.2/3
Answers
Answered by
1
Answer:
Step-by-step explanation:
Lets check each option one by one
A. 9 divisor are 1 and 3.
1+3=4
=9 so not a perfect number.
B. 15 divisors are 1,3, and 5.
1+3+5=9
=15 so not a perfect number
C. 21 divisors are 1, 3 and 7.
1+3+7=11
=21, so not a perfect number.
D. 6 divisors are 1,2 and 3.
1+2+3=6 It is a perfect number
So correct answer is option D
Similar questions