Find a formula a, for the n-th term of the following sequence. Assume the series begins at n = 1. 1 1 1' 8' 27 (Use symbolic notation and fractions where needed.) an = Find a formula b, for the n-th term of the following sequence. Assume the series begins at n = 1. 2 3 4 5'6' 7* (Use symbolic notation and fractions where needed.) b, =

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