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-OR-
an=dn+c
similar to
y=mx+b
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Using an= dn+c :
an= 5n+c
6 = 5(1)+c
c = 1
so an= 5n+1
and a100= 5(100)+1
= 501
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Using an= dn+c :
an= 2n+c
14 = 2(1)+c
c = 12
so an= 2n+12
and a100= 2(13)+12
= 38
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Using an= dn+c :
an= 2n+c
10 = 2(1)+c
c = 8
so an= 2n+8
a50= 2(50)+8 = 108
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What are the first & last terms of this series?
How many terms are there in this series?
So our formula for the sum is:
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Assignment: Section 7.2: problems 8-12, 14-16, 20-23, 29-37, 51-6
Section 7.4: problems 10-15, 17-26, 30-33, 36-38
(On all problems asking for recursive & explicit formulas, only give explicit
formula.)