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Which recursive formula can be used to define this sequence for n > 1?\newline11,23,35,47,59,71,11, 23, 35, 47, 59, 71, \ldots\newlineChoices:\newline(A) an=an1+12a_{n} = a_{n-1} + 12\newline(B) an=an112a_{n} = a_{n-1} - 12\newline(C) an=2311an1a_{n} = \frac{23}{11}a_{n-1}\newline(D) an=12an1a_{n} = 12a_{n-1}

Full solution

Q. Which recursive formula can be used to define this sequence for n>1n > 1?\newline11,23,35,47,59,71,11, 23, 35, 47, 59, 71, \ldots\newlineChoices:\newline(A) an=an1+12a_{n} = a_{n-1} + 12\newline(B) an=an112a_{n} = a_{n-1} - 12\newline(C) an=2311an1a_{n} = \frac{23}{11}a_{n-1}\newline(D) an=12an1a_{n} = 12a_{n-1}
  1. Sequence Type: We have the sequence: 11,23,35,47,59,71,11, 23, 35, 47, 59, 71, \ldots\newlineIs the given sequence geometric or arithmetic?\newlineThe difference between consecutive terms is the same.\newlineThe given sequence is arithmetic.
  2. Common Difference: Find the common difference, dd.\newlineTwo consecutive terms are 1111 and 2323.\newline2311=1223 - 11 = 12\newlineCommon difference (dd): 1212
  3. Recursive Formula: Identify the recursive formula for the given sequence.\newlineSince the common difference is 1212, the recursive formula will add 1212 to the previous term.\newlineRecursive formula: an=a(n1)+12a_n = a_{(n-1)} + 12
  4. Matching Choices: Match the recursive formula with the given choices.\newlineThe correct choice that represents the recursive formula an=an1+12a_n = a_{n-1} + 12 is:\newline(A) a=a+12a = a + 12\newlineThis is incorrect because it lacks the subscript nn to denote the sequence term.\newline(B) a=a12a = a - 12\newlineThis is incorrect because it subtracts 1212 instead of adding it.\newline(C) a=2311aa = \frac{23}{11}a\newlineThis is incorrect because it implies a geometric sequence with a ratio of 2311\frac{23}{11}.\newline(D) a=12aa = 12a\newlineThis is incorrect because it implies multiplying the previous term by 1212, which is not the case.\newlineThe correct recursive formula is not explicitly listed in the choices, but the intended correct choice seems to be (A) with a typographical error. It should be written as (A) an=an1+12a_n = a_{n-1} + 12.

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