Q 1447823783.     If `text()^nC_(r-1) = 10, text()^nC_r = 45` and `text()^nC_(r+ 1) = 120`, then `r` equals

A

`1`

B

`2`

C

`3`

D

`4`

HINT

Use `(text()^nC_r)/(text()^nC_(r-1))=(n-r+1)/r`
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