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Home > A2C > Chapter 9 > Lesson 9.1.2 > Problem 9-43


A sequence of pentagonal numbers is started below.

  1. Find the next three pentagonal numbers.

    What kind of sequence do the pentagonal numbers form?

  2. What is the equation for the nth pentagonal number?

    Is a constant being added to each number to obtain the next? Multiplied? Neither?

  3. What is the equation for the pentagonal number?