A number is selected at random between 20 and 30, both nu...
A number is selected at random between 20 and 30, both numbers inclusive. Find the probability that the number is a prime.
\(\frac{2}{11}\)
\(\frac{5}{11}\)
\(\frac{6}{11}\)
\(\frac{8}{11}\)
Correct answer is A
Possible outcomes are 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30. Prime numbers have only two factors, itself and 1. The prime numbers among the group are 23, 29.
The probability of choosing a prime number
= \(\frac{\text{Number of Prime}}{\text{No. of Total Possible Outcome}}\)
= \(\frac{2}{11}\)
In the diagram above, PQRS is a cyclic quadrilateral, ∠PSR = 86o and ∠QPR = 38o. Calcul...
Simplify 3\(\sqrt{27x^3y^9}\)...
Evaluate \(\frac{2\sin 30 + 5\tan 60}{\sin 60}\), leaving your answer in surd form....
Solve the equation x2 - 3x - 10 = 0...
Simplify \(\sqrt{50} + \frac{10}{\sqrt{2}}\)...
The nth term of the sequence -2, 4, -8, 16.... is given by ...