The number of terms which are not similar in the expansion of (l + m + n) ^6 is?

Dear Student,

Please find below the solution to the asked query :
We know that number of distinct term in the expansion of, x1+x2+....+xmn is n+m-1Cm-1So here  in l+m+n6 number of distinct term =6+3-1C3-1=8C2=8!2!×6!=28 


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