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Delvig
[45]
3 years ago
14
10 cards are numbered from 1 to 10 and placed in a box. One card is selected at random and is not replaced. Another card is then
randomly selected. What is the probability of selecting two prime numbers?
A) 2/15
B) 4/18
C) 7/90
D) 1/10
Mathematics
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1
answer:
katrin
[286]
3 years ago
4
0
The primes in the set [1,10] are 1,2,3,5,7 and the number of elements is 10 so
(5/10)(4/9)=20/90=2/9
which for some reason they converted to 4/18 :P
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