Question

what will be the probability of drawing a queen of heart at random from a well shuffled back of 51 cards ​

Answer 1

1/51 will be the probability

Answer 2

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There is exactly one two of hearts in an honest 52 card deck. So your chance of drawing that card is 1/52. There is similarly exactly one two of diamonds, so your chances of getting that card are also 1/52

You can add the two together, your chances of getting a red two are 2/52