# If in any binomial expansion a, b, c and d be the 6th, 7th, 8th and 9th terms respectively,

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If in any binomial expansion a, b, c and d be the 6th, 7th, 8th and 9th terms respectively, prove that:

(b2 - ac)/(c- bd) = 4a/3c .

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Let the binomial expansion be (x+y)n

Given,

Now, substituting the values of a, b, c and d, we get

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