Question: la 19. If A = 1 1, then A2 = B if a = ? and B = 3 20. If A = |-9

la 19. If A = 1 1, then A2 = B if a = ? and B = 3 20. If A = |-9 1 then what is I + 2A + 3A2 + 4A3 + 5A4 + ... o? -3 -6-
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