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### Primary 6 Problem Sums/Word Problems - Try FREE

- Patterns: You are awesome when you master this! > Patterns Exercise 4 > 2
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- Attempt Mode: Attempt Single Question

**Score :**

(Single Attempt)

**Question
**

According to the pattern shown above,

(a) How many circles are shaded blue in the 78th pattern?

(b) How many unshaded circles are there in the 90th pattern?

*Notes to students:*

*If the question above has parts, (e.g. (a) and (b)), given that the answer for part (a) is 10 and the answer for part (b) is 12, give your answer as:10,12*

The correct answer is :

**620,31683**