Question 380704
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Hi,
Mulitiplying 
Note: 1/5 = 3/15  and 1/3 = 5/15
( r + 1/5)(r+1/3) = (r + 3/15)(r + 5/15)
 r^2 + (8/15)r + 1/15 
Note:SUM of the inner product(3/15)r and the outer product(5/15)r = (8/15)r