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જો $a,b,c$ અને $d$ એ સંકર સંખ્યા હોય , તો નિશ્રાયક $\Delta = \left| {\,\begin{array}{*{20}{c}}2&{a + b + c + d}&{ab + cd}\\{a + b + c + d}&{2(a + b)(c + d)}&{ab(c + d) + cd(a + b)}\\{ab + cd}&{ab(c + d) + cd(a + d)}&{2abcd}\end{array}} \right|$ એ. . . .. પર આધારિત છે.