Write out the first 5 terms (starting with ao) of each of the sequences described below. Then give either a closed formula or a recursive definition for the sequence (whichever is NOT given in the problem). (a) a, = }(n² + n). (b) an = %3D 2an-1 - an-2 with ao = 0 and a1 = 1. (c) an =nan-1 with ao = 1. For cach soquon

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