maths cwk step squares final formula Watch

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i was given this final formula and i know how it works but i don't know how it was worked out. can n e 1 help?
(s(s+1)/2)x+(g+1)/6(x-1)(x+1)(x)

s=step size (height and width the same)
x=bottom left hand number
g=grid size

help!!!!!!!!!!!!!!

*Po*
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in the number the formule is x6
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