jessica put £580 in a savings account for one year. The interest rate was 6.5% work out the amount of money at the end of the ye
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Answer:
240
Step-by-step explanation:
We need to find the coeffeicent of the binomial expansion of
Note that
The binomial theorem states that
Using this, we let expand our series
So what term in the series eqaul x^-5.
That term is the 10 choose 7 term.
Because
So we need to compute 10 choose 7.
That equals
10!/3!(7!)= 10×9×8/6= 720/6=120.
So we get
So the coeffceint u
is 240