What is the next number in the sequence: 13, 15, 24, 52, 117?

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Understand the Problem

The question is presenting a sequence of numbers (13, 15, 24, 52, 117) and asking for the next number in the sequence. The goal is to identify the pattern or rule governing the sequence to calculate the next term.

Answer

The next number in the sequence is $243$.
Answer for screen readers

The next number in the sequence is $243$.

Steps to Solve

  1. Identify the differences between consecutive terms

Calculate the difference between each term in the sequence:

  • $15 - 13 = 2$
  • $24 - 15 = 9$
  • $52 - 24 = 28$
  • $117 - 52 = 65$

This gives us the differences: 2, 9, 28, 65.

  1. Identify the differences of the differences

Now, calculate the differences of these differences:

  • $9 - 2 = 7$
  • $28 - 9 = 19$
  • $65 - 28 = 37$

This gives us the second differences: 7, 19, 37.

  1. Identify the differences of the second differences

Next, calculate the differences of the second differences:

  • $19 - 7 = 12$
  • $37 - 19 = 18$

This gives us the third differences: 12, 18.

  1. Identify the next third difference

Assuming a linear pattern, the next third difference could be $18 + 6 = 24$.

  1. Calculate the next second difference

Now, add this to the last second difference:

$37 + 24 = 61$.

  1. Calculate the next first difference

Add this to the last first difference:

$65 + 61 = 126$.

  1. Calculate the next term in the sequence

Finally, add this to the last term:

$117 + 126 = 243$.

The next number in the sequence is $243$.

More Information

This sequence exhibits a pattern where each term follows a specific rule that involves consecutive differences. Recognizing the differences can help in predicting future terms in sequences.

Tips

  • Not calculating the differences accurately can lead to incorrect conclusions. Always double-check your arithmetic.
  • Assuming a pattern without checking the differences may lead to premature conclusions.

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