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Dyfyniad Arddull ChicagoNag, N K. Business Mathematic and Statistics Part 1. 3. Ludhiana: Kalyani Publishers, 1994.
Dyfyniad MLANag, N K. Business Mathematic and Statistics Part 1. 3. Kalyani Publishers, 1994.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.