In a survey of computer users, it was found that 50 use hp printers, 30 use ibm printers, 20 use apple printers, 13 use hp and ibm, 9 use hp and apple, 7 use ibm and apple, and 3 use all three. how many use at least one of these brands?

the answer is:

the answer is:

to solve the problem, we need to remember the quotient of power property, it's defined by the following relation:

if we have a quotienf of powers that have the same base, we need to keep the same base and subtract the exponent of the denominator power to the exponent of the numerator power.

so, we are given the expression:

then, calculating we have:

hence, the answer is:

have a nice day!

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step-by-step explanation: