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Three fair coins (faces 1 and 0): variance of the number of heads

The same question, asked 3 times: 11 May 2023 S1*, 9 May 2024 S1*, 12 May 2024 S2. Every wording below, oldest first.

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  1. Question 1

    11 May 2023 S1

    119
    If three fair coins are tossed, then variance of number of heads obtained, is

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  2. Question 2

    9 May 2024 S1

    133
    Three fair coins numbered 1 and 0 are tossed simultaneously. Then variance Var(X) of the probability distribution of random variable X, where X is the sum of numbers on the uppermost faces, is

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  3. Question 3

    12 May 2024 S2

    140
    Three fair coins with faces numbered 1 and 0 are tossed simultaneously. Then variance (X) of the probability distribution of random variable XX, where XX is the sum of numbers on the upper most faces, is

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