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Radha is drawing a dot Rangoli (a beauti...

Radha is drawing a dot Rangoli (a beautiful pattern of lines joining dots) with chalk powder. She has 9 dots in a row. How many dots will her Rangoli have for r rows? How many dots are there if there are 8 rows? If there are 10 rows?

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The correct Answer is:
When there are 8 rows, then number of dots `= 72`
When there are 10 rows, then number of dots `= 90`
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