N-combination R plus 2 times N-combination R minus 1 plus N-combination R minus 2 is...
N-combination R plus 2 times N-combination R minus 1 plus N-combination R minus 2 is...
N-combination R plus 2 times N-combination R minus 1 plus N-combination R minus 2 is equal to N plus 2-combination R. Proof that the first statement is equal to the second statement.?
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