. verify that f(x) = 2x/k(k + 1) for x = 1, 2, 3, ... , k can serve as the probability distribution of a random variable with the given range

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True , im kinda sure

This is called visual imagery. it is a memorization technique wherein an idea or a term is associated with an image, this in remembering ideas, especially as humans are very visual learners. this is also why visual aids a lot for memory retention.