Ononot — A researcher uses PPS sampling to select n=2 units from N=5

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A researcher uses PPS sampling to select $n=2$ units from $N=5$ with measures of size $M = \{10, 20, 30, 40, 50\}$ . The total size $M = 150$ . What is the inclusion probability $\pi_i$ for unit $i=1$ with $M_1=10$ ?