An arithmetic series has S10 = 100, t1 =1, and d = 2. How can you use this information to determine S11 without using a rule for the sum of an arithmetic series? What is S11?
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Answer:
T1=a1 =1
D=2
S11=n/2[2a+(n-1)d]
=11/2[2(1)+(11-1)2]
=11/2[2+20]
=11/2*22=
=11*11
=121
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