lenagonzalez84
lenagonzalez84
09-11-2021
Mathematics
contestada
Given 3 + 7 + 11 + 15 + ... find S20
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lmohamedali2008
lmohamedali2008
09-11-2021
=4n - 1
Since the sequence is add 4 and 3-4 = -1
20 x 4n = 80-1 = 79
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