ThunderThighsM8
09.02.2022 •
Mathematics
A research lab grows a type of bacterium in culture in a circular region. The radius of the circle, measured in centimeters, is given by begin mathsize 12px style r left parenthesis t right parenthesis space equals space 5 space minus space fraction numerator 6 over denominator t squared plus 3 end fraction end style, where t is time measured in hours passed since a circle of a 1cm radius of the bacterium was put into the culture. Express the area, A open parentheses t close parentheses, of the bacteria as a function of time, and find the approximate area of the bacterial culture in 4 hours.
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Ответ:
Probability that the first card dealt is black,the second red and the third black is O.127
Step-by-step explanation: Total number of cards=52
Total number of black cards =26
Total number of red cards=26
Probability of pulling black=26/52
Probability of pulling red=26/51
Probability of pulling a mother black=25/50
Probability of pulling 3 cards =26/52×26/51×25/50
16900/132600
=0.127