MATH!!!!!

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there are 15 terms in the expansion of the binomial (a+b)^n. determine the value of n.
please explain to me how to come about this!
thanks!

  • MATH!!!!! -

    (a+b)^1 has 2 terms
    (a+b)^2 has 3 terms
    ....
    (a+b)^15 has ----- terms.

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