Twelve blocks are prepared, so 4 are red , 4 are white, and 4 are blue. what is the probability of picking a red block

What is f(3) for the quadratic function f(x)= 2x^2+ + x - 12

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Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236