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Use the Appropriate Formula to Find the Indicated Figurate Number $\mathrm { P } _ { 6 } = 21$

Question 128

Multiple Choice

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

A) $\mathrm { P } _ { 6 } = 21$
B) $\mathrm { P } _ { 6 } = 36$
C) $\mathrm { P } _ { 6 } = 57$
D) $\mathrm { P } _ { 6 } = 51$

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