Are Triangular Numbers Arithmetic?
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Questions and Answers

What is the sequence of triangular numbers?

  • The sequence of partial sums of an arithmetic sequence (correct)
  • An arithmetic sequence
  • The sequence of partial sums of a geometric sequence
  • A geometric sequence

    • What is the closed formula for the triangular numbers?

  • T_n = n(n+1)/2 (correct)
  • T_n = n
  • T_n = n^2
  • T_n = (n+1)/2

    • What is the relationship between triangular numbers and handshakes at a party?

  • There is no relationship
  • Triangular numbers count the number of people at a party
  • Triangular numbers count the number of handshakes at a party (correct)
  • Triangular numbers count the number of drinks at a party

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