exam Maths Puzzle Numerical Ability

A bag contains 6 red marbles, 9 blue marbles, and 5 green marbles. You withdraw one marble, replace it, and then withdraw another marble. What is the probability that you do NOT pick two green marble?

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Hello area you today?
Perform the indicated operation

a^2-2a + 4/a^2-4 X (a +2)^3/2a+4

( a -2) (a - 2) = (a +2)(a = 2)(a + 2)
A^2 � 4 Explain to agrade 9 how to add rational expressions. Give attention to the following: -how to determine the LCD(lowest common denominator)
-what to do when adding ratio