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Aratati ca nr.A=12^n ori 24 +3^n+2 ori 4^n+1 + 2^n+3 ori 6^n

Răspuns :

A=12^n × 24 +3^n+2 × 4^n+1 + 2^n+3 × 6^n=
=2^2n ×3^n× 2^3×3 +3^n+2 × 2^2n+2 + 2^n+3 × 2^n×3^n=
=2^2n+3 × 3^n+1 +3^n+2 × 2^2n+2 + 2^2n+3 ×3^n=
=2^2n+2 × 3^n(2×3 +3^2 × 1 + 2^1 ×1)=
=2^2n+2 × 3^n(6 +9 + 2)=
=2^2n+2 × 3^n  × 17  deci divizibil cu 17