Question: (a) If n = n 1 + n 2 + n 3 show that (This represents the number of ways in which n objects may

(a) If n = n1 + n2 + n3 show that

(2)(

(This represents the number of ways in which n objects may be divided into three groups containing respectively n1, n2 and n3 objects.)

(b) Expand the following expressions

(1- (i) 1 2 5 (ii) (32x)6

(2)(". n n n + Mz M n! n! n! nz!

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