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if 56 xx 75 xx 60 xx 84 xx 210 = 2^p xx ...

if `56 xx 75 xx 60 xx 84 xx 210 = 2^p xx 3^q xx 5^r xx 7^s`, then what is the value of `[(p+q)//s]+r` = ?

A

a) 6

B

b) 8

C

c) 12

D

d) 10

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