Solve the problem.For what value of r does the infinite series 1 + 9r + r2 + 9r3 + r4 + 9r5 + r6 + ... converge?
A. |r| < 
B. |r| < 1
C. |r| < 
D. |r| < 9
Answer: B
Mathematics
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A. ?CBG
B. 
C. 
D. 
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A. x5 + 10x4 + 40x3 + 80x2 + 80x + 2 B. x5 + 10x4 + 40x3 + 80x2 + 80x + 32 C. x5 + 10x4 + 80x3 + 160x2 + 80x + 32 D. x5 + 10x4 + 80x3 + 160x2 + 80x + 2
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