দেওয়া আছে, A=273, B=643,C=2n, D=2n-1 and E=2n-1
এখন, AC-BDC-E=3×2N-4×2N-22N-2N-1
=3×2N-4×2N×2-22N-2N×2-1 =2N(3-4×2-2)2N(1-2-1) =3-4×141-12 =3-12-12 =212 =2×21 =4
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