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यदि a,b,c समांतर श्रेढ़ी में हो , तो निम्न सारणिक का मान ज्ञात कीजिए -
`|(2y+4,5y+7,8y+a),(3y+5,6y+8,9y+b),(4y+6,7y+9,10y+c)|`

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संक्रिया `R_2toR_2(2)` से ,
`Delta=(1)/(2)|(2y+4,5y+7,8y+a),(6y+10,12y+16,18y+2b),(2y+6,7y+9,10y+c)|`
`rArrDelta=(1)/(2)|(2y+4,5y+7,8y+a),(0,0,2b-(a+c)),(4y+6,7y+9,10y+c)|`
[संक्रिया `R_2toR_2-(R_1+R_3)` से] ,
`rArrDelta=(1)/(2)|(2y+4,5y+7,8y+a),(0,0,0),(4y+6,7y+9,10y+c)|`
(`because a,b,c` से , क्षे. में है, तब `therefore 2b=a+c` )
`rArr Delta =0`, (`because R_2` के सभी अवयव शुन्य है. )

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