<PRE><B>Question 863863</B>
 If you pile oranges in a pyramid that has 1 orange in the top layer, 4 in the next layer nine in the third layer, and 16 in the fourth layer, how many oranges will you need to make a pile with 10th layer?
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Sum = 1 + 4 + 9 + 16 + ... + 100
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Sum = (n(n+1)(2n+1)/6
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Ans = [10*11*21)/6 = 770
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Cheers,
Stan H.
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