Answer
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D45 = 7,965

↓Steps Explained:↓

Calculate decagonal number 45

Decagonal Number Definition

Decaongal = A figurate number.

Decagonal Number Formula

D45 = 4n2 - 3n

Plug in n = 45

D45 = 4(452) - 3(45)

D45 = 4(2025) - 135

D45 = 8100 - 135

D45 = 7,965
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