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Please anser to my question

Please Anser To My Question class=

Răspuns :

A=5ⁿ⁺²+5ⁿ⁺¹-5ⁿ=
=5ⁿ×(5²+5¹-5°)=
=5ⁿ×(25+5-1)=
=5ⁿ×29  deci divizibil cu 29