a vendor artanged his apples as shown a) if there are ten rows of apples , can you find the total number of apples without actually counting it
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There are 54 apples in 10 rows
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n(n+1)/2
n=10
then. 10(10+1)/2=. 5*11=55
n=10
then. 10(10+1)/2=. 5*11=55
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