Answer:
<em>The probability that the button is not white is </em><em>0.583</em>
Step-by-step explanation:
The jar contains 30 red, 40 blue, and 50 white buttons.
In total there are 120 buttons in the jar. So,
Let us assume that, A be the event of picking white buttons, so
So the probability of picking white button is,
Then the event will be not picking up white buttons, so the probability of not picking up white buttons is,
3-i/2
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This is number a and I will list take the other
S = n(a1 + an)/2
2S = n(a1 + an)
2S = na1 + nan
nan = 2S - na1
an = (2S - n a1)/n