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**1. Homework Statement**

Compute the following double sum

(n=3)(i=0)[tex]\sum[/tex](n=2)(j=0)[tex]\sum[/tex](3i+2j)

**2. Homework Equations**

sums

**3. The Attempt at a Solution**

my answer follows expanding the first sum, then just doing the last one

i get

(n=3)(i=0)[tex]\sum[tex](6+9i) = 78

thanks!