Question: 3. Use the multinomial theorem to explain and verify the identity. (9 points) E 20 272 ( - 3) 123 = 0 n1 n2 n3

3. Use the multinomial theorem to explain and
3. Use the multinomial theorem to explain and verify the identity. (9 points) E 20 272 ( - 3) 123 = 0 n1 n2 n3 n1+n2+n3=20

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