An r-sided die with values 1, 2, ..., r is rolled 2n times and the results are placed in a sequence (a₁, a2,..., a2n). Find the probability that a₁ ≥ a2, az ≥ a4,..., a2n-1 ≥a2n.

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Q: an Argand diagram. (a) X+Y A = 2+j3 B = 3+j2C= 3-12 D=1-j2 E= -3+j2(F= -2+j1

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A: Given  that and Then,Now, Now,   Since, Now,               and

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Q: True or false?

A: In each case we write the answer and some explanation is discuss.