#2**+2 **

I agree with guest EXCEPT 1 will divide 1,2 1,3 1,4 1,5

so 5 choices out of 10 5/10 = 1/2

ElectricPavlov
Mar 23, 2018

#1**+1 **

Since 5C2 = 10 combinations of 2 numbers as follows:

{1, 2} | {1, 3} | {1, 4} | {1, 5} | {2, 3} | **{2, 4}** | {2, 5} | {3, 4} | {3, 5} | {4, 5} (total: 10)

Therefore there is only 1 such combination {2, 4} out of a total of 10.

Probability = 1/10

Guest Mar 22, 2018

edited by
Guest
Mar 22, 2018

#2**+2 **

Best Answer

I agree with guest EXCEPT 1 will divide 1,2 1,3 1,4 1,5

so 5 choices out of 10 5/10 = 1/2

ElectricPavlov
Mar 23, 2018