exam Maths Puzzle Numerical Ability

It was found that 60% of American victims of health care fraud are senior citizens. If 10 victims are randomly selected, find the probability that exactly 3 are senior citizens.

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How do you find the domain of this function algebraically??

y= square root of x^4 -1 Twice the sum of a number and 5 is equal to three times the difference of the number and 6. Can you help me find the number?