Question: =+2.2. Let A ,..., A ,, be arbitrary events, and put UR = U(A, n ... NA, ) and IK = n(A ,, U .

=+2.2. Let A ,..., A ,, be arbitrary events, and put UR = U(A, n ... NA, ) and IK = n(A ,, U . . . UA,), where the union and intersection extend over all the k-tuples satisfying 1 si< ... < ik sn. Show that Uk = In-k+1.

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