203 = 20 x 20 x 20 = 8000
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20 cubed (20 x 20 x 20) is equal to 8,000.
20 cubed cubed = [203]3 = (20 x 20 x 20)3 This equals 20 x 20 x 20 x 20 x 20 x 20 x 20 x 20 x 20 which = (20)9 The rule to work it out is:multiply the two exponents ie 3 x 3 = 9 206 is 20 x 20 x 20 x 20 x 20 x 20 which is obviously less than 209. See: http://oakroadsystems.com/math/expolaws.htm#WhatsNew#WhatsNew
It must end in 5 as that is the only number multiplied by itself 3 times that would give 5 as an answer. 5 cubed is 125 10 cubed is 1000 20 cubed is 8000 so the answer is between 10 and 20. 15 is only possibility in that range. 15 cubed is 3375
8,000. each row's sum is the row # cubed. so the 20th row is 20*20*20 = 8000
2 cubed is 8.3 cubed is 27.4 cubed is 64.5 cubed is 125.6 cubed = 216.7 cubed is 343.