Given 1 + 2 + 3 ····· + 31 + 32 + 33 = 17 times 33, find the value of 1-3 + 2-6 + 3-9 + ······· + 31-93 + 32-96 + 33-99,

1-3+2-6+3-9+········+31-93+32-96+33-99
=1+2+3+····+33-(3+6+9+····+99)
=1+2+3+····+33-3*(1+2+3+····+33)
=-2*(1+2+3+····+33)
=-2*17*33

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