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4181.If the sum and product of the roots of a quadratic equation are 55 and 66 respectively, which of the following represents the correct quadratic equation?
4182.Three years ago, the age of a father was three times the age of his son. If the sum of their current ages is 70 years, what is the present age of the son?
4183.If x + 1/x = 15, then the value of x² + 1/x² is _____?
4184.Which of the following is a surd?
4185.If x:y = 3:4 and y:z = 2:5, then x:z is ____?
4186.What is the mean of first five natural number?