Answer :

Answer:

Step-by-step explanation:

(1+x)^6 = (1+3)^3 x (1+3)^3

(1+3x+ 3x^2+x^3) x (1+3x+ 3x^2+x^3)

1+ 6x+15x^2+20x^3+15x^4+6x^5+x^6

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