Use the Appropriate Formula to Find the Indicated Figurate Number $\mathrm { T } _ { 6 } = 18$

question 180

Multiple Choice

Use the appropriate formula to find the indicated figurate number.
-the 6th triangular number

• A) \(\mathrm { T } _ { 6 } = 18\)
• B) \(\mathrm { T } _ { 6 } = 15\)
• C) \(\mathrm { T } _ { 6 } = 42\)
• D) \(\mathrm { T } _ { 6 } = 21\)

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