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

User Magnotta
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1 Answer

4 votes
=4n - 1
Since the sequence is add 4 and 3-4 = -1

20 x 4n = 80-1 = 79
User Prasath Govind
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