Answer :

Given: 20Cr+1 = 20Cr–10 Need to find: Value of 10Cr We know, one of the property of combination is: If nCr = nCt, then, (i) r = t OR (ii) r + t = n We can’t apply the property (i) here. So we are going to use property (ii) 20Cr+1 = 20Cr–10 By the property (ii), r + 1 + r – 10 = 20 2r = 29 r = 14.5 We need to find out the value of 10Cr. But here r can’t be a rational number. Therefore the value of 10Cr can’t be find out.

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