## anonymous one year ago What is the fourth term of the expansion of the binomial (2x + 5)5

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1. anonymous

In the expansion of $\left( x+a \right)^n$ (r+1)th term is $T _{r+1}=C _{r}^{n}x ^{n-r}a ^{r}$ put x=2x,a=5 n=5 and calculate.

2. anonymous

r+1=4 r=4-1=3