Q15 of 51 Page 18

Find the number of terms in the expansion of (a + b + c)n.

Given:


Tn = ;


Where p + q + r = n


Since number of ways in which we can divide n different things into r different things is : n+r-1Cr-1


Here, n=n & r=3


So, n+3-1C3-1 = n+2C2





so, the number of terms


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