**Question**

**Introduction**

This Additional
Mathematics question is challenging because the index

*n*of the binomial power is unknown but you only know the ratio of a pair of coefficients. Usually the*n*is given and you just plug in the formula and apply the binomial expansion formula.**Reminder**

**Solution**

H05. Work backwards

H13* Use
Equation / write a Mathematical Sentence

**Suitable Levels**

*****GCE ‘O’ Level Additional Mathematics

*****GCE ‘A’ Levels H2 Mathematics (revision)

*****IB Mathematics (revision)

* other syllabuses that involve Binomial
Theorem for higher powers

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