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Mathematics, 13.12.2021 21:00 rose3358

In a bag there are pink buttons, yellow buttons and blue buttons. There are five times as many pink buttons as yellow buttons.
number of yellow buttons : number of blue buttons = 4 : 7

One button is selected at random.
Work out the probability that the button is either pink or blue.
Give your answer as a fraction in its simplest form.

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