Answer:
4095
Explanation:
This can be evaluated by substituting n = 1 to n = 6 into the expression and summing the terms, that is
3( )
= 3( + + 4² + 4³ + + )
= 3(1 + 4 + 16 + 64 + 256 + 1024)
= 3(1365)
= 3 × 1365
= 4095
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)
+ 
+ 4² + 4³ + 
+ 
)