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September 23, 2014

September 23, 2014

Posted by **purple1** on Saturday, March 20, 2010 at 8:16pm.

what are the last three terms of

(a-b)^7

- math -
**Reiny**, Saturday, March 20, 2010 at 8:44pmLook up "Pascal's Triangle", you will find it very useful for these type of questions.

If not then ....

(a-b)^10

= a^10 + 10a^9(-b) + 10*9/2!a^8(-b)^2 +

= a^10 - 10a^9b + 45a^8b^2 + ...

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