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primary 6 | Maths
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Date Posted: 7 years ago
Views: 305
Use this rule: Xn = n(n+1)/2
The answer should be no. (1)
The pattern will be adding the no. until the fig no.
So, you will have to take 1+2+3..........+18+19+20
And to do that, you should take 20×21÷2= 210
The pattern will be adding the no. until the fig no.
So, you will have to take 1+2+3..........+18+19+20
And to do that, you should take 20×21÷2= 210
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done
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Hope it helps
Date Posted:
7 years ago
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