Question

1/2
Find the sixth term of expansion of
+212) , if the binomial
wefficient of the third term from
the end is 45.​

Answer 1

Answer:

$let \: \: the \: \: 6^{th} \: \: term \: \: be \: \: x \\ \\ \frac{1}{2} + 212 + x = 45 \\ \\ 1 + 212 + x = 45 \times 2 \\ \\ 1 + 212+ x = 90 \\ \\ 213 + x = 90 \\ \\ x = 90 - 213 \\ \\ x = - 123$