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P(x) = 2x / n(n+1), x = 1 to n: find E(X)

The same question, asked 2 times: 12 May 2024 S1, 14 May 2024 S2. Every wording below, oldest first.

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  1. Question 1

    12 May 2024 S1

    110
    The p.m. of random variate XX is P(X)=2xn(n+1),  x=1,2,3,…,nP(X)=\frac{2x}{n(n+1)},\;x=1,2,3,\ldots,n. Then E(X)=E(X)=

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  2. Question 2

    14 May 2024 S2

    128
    The p.m.f. of a random variable X is P(x)=2xn(n+1),  x=1,2,…,nP(x) = \frac{2x}{n(n+1)},\; x=1,2,\ldots,n, then E(x)E(x) is

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