(a+1)^n꼴에서a+1)^1=a+1(a+1)^2=a^2+2a+1(a+1)^3=a^3+3a^2+3a+1(a+1)^4=a^4+4a^3+6a^2+4a+1(a+1)^5=a^5+5a^4+10a^3+10a^2+5a+1로전개됩니다.위에서^n은n제곱입
당신은 어느 그룹입니까?