Q. 74.2( 120 Votes )

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Answer :

It is given in the question that,


Number of dots in 1 row = 9


Also,


Number of rows = r


Therefore,


Total number of dots in r rows = Number of rows × Number of dots in a row


= 9 × r


= 9r


Hence,


Number of dots in 8 rows = 8 × 9 = 72


Also,


Number of dots in 10 rows = 10 × 9 = 90

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