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Question

If A=320140005.Find A2

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Solution

A2=A.A=320140005320140005
=3×3+2×1+0×03×2+2×4+0×03×0+2×0+0×51×3+4×1+0×01×2+4×4+0×01×0+4×0+0×50×3+0×1+5×00×2+0×4+5×00×0+0×0+5×5
=9+2+06+8+00+0+03+4+02+16+00+0+00+0+00+0+00+0+25
=1114071800025

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