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Question

Tasha is drawing a dot rangoli. She has 9dots in a row. How many dots will her rangoli have for r rows,..? How many dots are will her rangoli have for r rows,.?if there were 10rows.?

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Solution

Number of dots in a row = 9
Number of rows is a variable r.
Total number of dots in r rows = number of dots in one row × number of rows
= 9r
Total number of dots in 10 rows = number of dots in one row × number of rows
= 9 × 10 = 90

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