alguém sabe macetes p/ decorar formulas de progressão aritmética e geométrica?

Ex. de P.A:

An= A1 + (n-1).r

Sn= (a1+An). n / 2

Ex. de P.G:

An= A1 . q (elevado a n-1)

Sn= A1. (q elevado a n -1) / q-1

Sn= A1 / q-1

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