1 by n = 1 by 5n - n - 1 by 5n
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Step-by-step explanation:
1 by n = 1 by 5n - n - 1 by 5n
a1 = (- 1)1 - 1 51 + 1 = 52 = 25
a2 = (- 1)2 - 1 52 + 1 = - 53 = - 125
a3 = (- 1)3 - 1 53 + 1 = 54 = 625
a4 = (- 1)4 - 1 54 + 1 = - 55 = - 3125
a5 = (- 1)5 - 1 55 + 1 = 56 = 15625
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