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If ((18),(r-2))+2((18),(r-1))+((18),(r))...

If `((18),(r-2))+2((18),(r-1))+((18),(r))ge((20),(13))`, then the number of values of r are

A

`r=7`

B

`r=8`

C

`r=9`

D

`r=10`

Text Solution

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The correct Answer is:
a,b,c,d
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