**Question**

**Introduction**

This
difficult-looking question has become pretty standard already. There are some principles that the schools
may or may not teach explicitly, but they expect students to know. Let us review some of these principles.

**Reminders**

Refer also to this article.

**Solution**

**Summary**

Remember
that when you apply a formula (e.g. like the formula for the sum of an AP), you
need to apply it with the appropriate numbers substituted. Do not get stuck with the letters. They are not meant to be taken literally, but change
according to the situation. For example,
the “

*d*” in the later part is 4 but it is different than the*d*= 2 in the earlier part.
H04. Look for
pattern(s)

H09. Restate
the problem in another way

H10. Simplify
the problem

H11. Solve part
of the problem

H12* Think of a
related problem

H13* Use
Equation / write a Mathematical Sentence

**Suitable Levels**

* GCE ‘A’ Levels, H2 Mathematics

* International Baccalaureate Mathematics

* other syllabuses that involve arithmetic
and geometric progressions

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