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What is the expansion of the series "sum from n equals 1 to 4 of 3 to the n plus 1 power question mark" (photo includes proper equation)

9 + 27 + 81 + 243
9 + 12 + 15 + 18
3 + 9 + 27 + 81
3 + 6 + 9 + 12

What is the expansion of the series sum from n equals 1 to 4 of 3 to the n plus 1 power question mark photo includes proper equation 9 27 81 243 9 12 15 18 3 9 class=


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