3. What is the theoretical probability that a coin toss results in two tails showing? i got 19 of two tails

The probability of getting tails is 1/2 assuming we have a fair coin (both sides are equally likely).

The probability of getting two tails in a row is (1/2)*(1/2) = 1/4 since each coin flip is independent. You could flip two different coins at the same time, or flip a single coin twice, and it's the same basic idea.

I'm not sure what you mean when you wrote "19 of two tails".

25

step-by-step explanation:

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,