IMAT 2017 Q6- Matchstick Problem


Solution please?

@Walina the answer is 220?
In the sample picture we have 2 rows of 2 and in order to put these matches horizontally we use 3×2 matches and also to put these matches vertically we use 3×2 matches. So the product will be 12 matches.
If we had 10 rows of ten we should use 10×11+10×11=220 matches.

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(Click on the link for the worked solution)

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