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$0.2\dot8$$=\frac{28-2}{90}$$=\frac{26}{90}$$=\frac{13}{45}$

$42.\dot1\dot8$$=\frac{4218-42}{99}$$=\frac{4176}{99}$$=\frac{465}{11}$

এখন,

$0.2\dot8 \times 42.\dot1\dot8$$=\frac{13}{45}\times\frac{465}{11}$$=\frac{6032}{495}$$=12.1\dot8\dot5$

নির্ণেয় গুণফল $12.1\dot8\dot5$

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