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if the first three terms in the expansion of (1-ax) n where n is a positive integer are 1,-4x and 7x 2 respectively then a =

if the first three terms in the expansion of (1-ax)n where n is a positive integer are 1,-4x and 7x2 respectively then a =
 

Grade:9

1 Answers

Nishant Vora IIT Patna
askIITians Faculty 2467 Points
7 years ago
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