An equation in binomial coefficients
An equation in binomial coefficients
Secondary 3
Do not use a calculator in this question.
- Given that \(\binom n2=2\binom n1+12\), where \(n\) is a positive integer, find the value of \(n\).
- Hence find the coefficient of \(x^2\) in the expansion of \((1+2x)^n\).
Solution:
Solution locked
680+ questions here come with free worked solutions. A free account saves your questions and progress; this one needs a course plan.
Create a free account to practise similar questions.
Answer:(a) \(n=8\) (b) \(112\)
Need help? Join our A-Maths tuition classes.
Learn more