Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$\sum _ { n = 2 } ^ { 6 } ( 2 n + 1 ) ( 3 n - 1 )$$

Evaluate

$555$

Factor

$3\times 5\times 37$

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