Which of the Following Is a Power Series?
1) $1 + 2 x + 3 x ^ { 4 }$

question 57

Multiple Choice

Which of the following is a power series?
1) $1 + 2 x + 3 x ^ { 4 }$
2) $\sum _ { n = 1 } ^ { \infty } ( 5 x + 1 ) ^ { 2 n }$
3) $\sum _ { n = 1 } ^ { \infty } \frac { 2 ^ { n } } { x ^ { n } }$

• A)None
• B)1
• C)2
• D)3
• E)1, 2
• F)1, 3
• G)2, 3
• H)1, 2, 3

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