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binomial theorem help

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sweet777:
"when r = 2 the coefficient is 252

nC2 * (ax)2

nC2 * a2x2 = 252x2

nC2 = (n2 - n)/2"
hey..i gt dpart in which a=24/n....but i really dont understand how you got (n2 - n) from a2x2=252x2

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