Binar operatsiyalarining ba’zi elementlari. Neytral element


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Matematik induksiya yordamida isbоtlang.

  1. n=1; 1*2=

  2. n=k ; 1*2+2*3+3*4+...+k(k+1)=

  3. n=k+1; 1*2+2*3*4+k(k+1)+(k+1)(k+2)=

Isbot. 1*2+2*3+3*4+k(k+1)+(k+1)(k+2)=(k+1)(k+2)=

=(k+1)(k+2)=(k+1)(k+2)= .
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