Prove that the number 3 + 3x3 + 3x3x3 + 3x3x3x3 + .... + 3 to the power of 60 is divisible by 2x2x2x3x5x11x11x13
Hints: 1+3+3x3 = 13; 1+3+3x3+3x3x3 = 40; 1+3+3x3+3x3x3+3x3x3x3 = 121
5th grader math rocks! problem - r u smarter than a 5th grader?
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回複:5th grader math rocks! problem - r u smarter than a 5th grade
-Jinjing-
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02/09/2010 postreply
17:08:48
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brilliant
-一用戶-
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02/09/2010 postreply
19:00:04
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it's harder without the HINT.
-pj-
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02/12/2010 postreply
06:43:57
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回複:it's harder without the HINT.
-Jinjing-
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02/12/2010 postreply
08:22:13
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回複:5th grader math rocks! problem - r u smarter than a 5th grade
-hisch-
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02/18/2010 postreply
16:08:33
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Different Proof
-hisch-
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02/18/2010 postreply
16:10:06