P : Q = 3 : 5, Q : R = 7 : 4 మరియు R : S = 5 : 6 అయితే, P : Q : R : S అంటే –

1
21 : 35 : 20 : 24
2
21 : 25 : 20 : 24
3
27 : 35 : 20 : 21
4
21 : 35 : 30 : 25

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