Solve this expansion related question.
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Very nice question
Step-by-step explanation:
put x=1
(3x - 1)^7 = a7x^7 + a6x^6 +........... + a1x + a0
you will get
2^7 = a7 + a6 + a6 + ........... + a1 + a0
so answer is 2^7 = 128
Answer = 128
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