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

- Patterns: You are awesome when you master this! > Patterns Exercise 3 > 1
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**Question
1 of 3**

Study the diagrams shown. According to the diagrams,

(a) How many shaded circles will there be in diagram 4?

(b) How many shaded circles will there be in diagram 5?

(c) How many unshaded circles will there be in diagram 5?

(d) What is the total number of circles needed to form diagram 139?

*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 :

**15,15,21,19600**