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Find the number of 5 combinations and 5 permutations of {5.a, 3.b, 2.c, 3.d, 2.e, 1.f, 4.g}? What two ways by which integration could affect the Carribbean region? Calculate the pH and find the fraction of dissociation of 0.5 M benzoic acid? Given the sequence an = n / (n + 1), what is a100? Modern Algebra: Let sigma = (i1 i2 ... ir) be a cycle in Sn and tau be in Sn. Prove that tausigmatau^-1 = (tau(i1) tau(i2) ... tau(ir)).?