RRB Government Jobs Exams

Given the relation A = {(5,2), (7,4), (9,10), (x, 5)}. Which of the following values for x will make relation A a function?

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RRB Other Question

Lisa will make punch that is 25% fruit juice by adding pure fruit juice to a 2-liter mixture that is 10% pure fruit juice. How many liters of pure fruit juice does she need to add? he following relation is a function.
{(10,12), (5,3), (15, 10), (5,6), (1,0)}