The \( 2^{\text {nd }}, 3^{\text {rd }}, 4^{\text {th }} \) terms in the expansion of \( (x+y)^{...

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The \( 2^{\text {nd }}, 3^{\text {rd }}, 4^{\text {th }} \) terms in the expansion of \( (x+y)^{n} \) are \( 240,720,1080 \) respectively; find \( x, y, n \).
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