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Primary 6 Problem Sums/Word Problems - Try FREE

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(Single Attempt)

Question

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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:
  1. 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
(a)____(b)____