I might as well add to this. Suppose that it is true for , i.e. is divisible by . Look at So . That is clearly divisible by .
Last edited by Plato; August 21st 2010 at 03:28 PM.
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Originally Posted by Plato I might as well add to this. Suppose that it is true for , i.e. is divisible by . I think you've meant ...
Originally Posted by Soroban Hello, yuud! Here is a sneaky method . . . if you know modulo arithmetic. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . It is divisible by 7 for all positive intergers . I haven't studied modular arithmetic... but THANKS
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