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If (p_1=1) and (p_n=p_{n-1}+n^2-n), what is the value of (p_5)?

Answer and explanation

Correct answer: 41

In the recursive rule, add n^2-n to the preceding term for each value of n. Thus, p_2=1+(2^2-2)=3, p_3=3+(3^2-3)=9, p_4=9+(4^2-4)=21, and p_5=21+(5^2-5)=41. Therefore, the correct answer is 41. A value such as 43 can result from incorrectly handling the first increment, 2. Exam tip: To find p_5, list the successive values from n=2 to n=5 systematically.

Related tags

SequencesProgressionsRecursive RuleRecurrence RelationClass 9 MathematicsSequences And ProgressionsMathematicsClass 9 Mcq

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