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Sidney Valdez
Mathematics
4 May, 02:40
Find S7 for 3 + 8 + 13 + 18 + ...
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Payten
4 May, 02:58
0
A = 3
d = 8-3
=5
S7=n/2[2a + (n-1) d]
S7=7/2[2 (3) + (7-1) 5]
S7=3.5 (6+30)
=126
sorry if im wrong
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