The number of dots of rangoli is 10. Rita coloured r dots of the rangoli . Her sister coloured 4 dots less than rita. Find the dots coloured by tulsi?
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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 8 rows =9×8=72
Total number of dots in 10 rows =9×10=90
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