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Liula [17]
2 years ago
8

Given 3 + 7 + 11 + 15 + ... find S20

Mathematics
1 answer:
nasty-shy [4]2 years ago
6 0
=4n - 1
Since the sequence is add 4 and 3-4 = -1

20 x 4n = 80-1 = 79
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