the first 3 terms in the expansion of (1 + ax) to the power n are 1+4x+7x to the power 2 ,find n and a

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- June 9th 2009, 02:54 AMjoey1binomial theorem factorial
the first 3 terms in the expansion of (1 + ax) to the power n are 1+4x+7x to the power 2 ,find n and a

- June 9th 2009, 05:08 AMmathaddict