Answer:
Given, the number of rows = r and the number of dots in one row i.e. r = 1 is 9 \[\times \] 1 = 9 \[\therefore \] the number of dots in 2 rows i.e. r = 2 is 9\[\times \]2 = 18 the number of dots in 3 rows i.e. r = 3 is 9 \[\times \] 3 = 27 \[\therefore \] Total number of dots in r rows is = 9 \[\times \] r = 9r Now, if there are 8 rows i.e. r = 8, then the number of dots = 9 \[\times \] 8 = 72 dots and for r = 10, the number of dots = 9 \[\times \] 10 = 90 dots.
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