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Find S7 for 3 + 8 + 13 + 18 +…

Find S7 for 3 + 8 + 13 + 18 +…
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1 vote
Find S7 for 3 + 8 + 13 + 18 +…

User Andrew Joslin
by
8.3k points

1 Answer

3 votes
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
User Jake Duth
by
8.1k points
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