If {{ }^{50} {C}_{5 {r}}}/{{ }^{50} {C}_{ {r}}}=29 \times 43 \times { {a}}/{ {b}} where {a} \in {l}^{+} is not a multiple of 47 and {b} \in {I}^{+} then which of the following is true?

r has two different integer values

exponent of prime number 3 in {{ }^{50} {C}_{5 {r}}}/{{ }^{50} {C}_{ {r}}} is 2