Probability
How to do

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Step-by-step explanation:

Probability is the likelihood of one or more events happening divided by the number of possible outcomes. Calculating the probability of multiple events is a matter of breaking the problem down into separate probabilities and the multiplying the separate likelihoods by one another.

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no: of possible outcomes/ total no: of outcomes ..  

for example ..

wht is the probability of getting an even number on a die ... ?

total numbers on a die = 6

even numbers= 2,4,6

no: of even numbers= 3

probability = 3/6 = 1/2

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x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a