DICE PROBLEM

If you roll three dice, what's the probability of AT LEAST 2 of the dice showing the same value?

4/9

Step-by-step explanation:

P(Same, same, different)

= 3(6×1×5)/6³

= 5/12

P(3 same) = 6/6³ = 1/36

5/12 + 1/36

= 4/9

option 1 is correct.

step-by-step explanation:

y varies inversely with x and constant of variation is 4

the equation will be:

y = k/x

where k =4 so,

y = 4/x

if we put values of x of option 1 in the above equation and find values of y

y = 4/-2 => y =-2

y = 4/-1 => y = -4

y = 4/1 => y = 4

y = 4/2 => y =2

so, all the values of x and y are correct.

if we put values of x given in other options and find value of y we cannot find whole table satisfying the equation.

hence option 1 is correct.

step-by-step explanation: a reaction is first order. if the initial reactant concentration is 0.0200 m, and 25.0 days later the concentration is 6.25 x 10-4 m, then its half-life is: