Yes! and school already rekt both of us last week including today! so much fun! Especially this unlimited funtime game you need to solve! ∑^9 k³ (k=4) = ∑^6 k³ (k=1) + 9 ∑^6 k² (k=1) + 27 ∑^6 k (k=1) + 162 ... = ... ∑^n ( 5k - 3 )² (k=1) = 25 ∑^n k² (k=1) - 30 ∑^n k + 9n (k=1) ... = ...