यदि p ∶ q = 3 ∶ 5, r ∶ s = 3 ∶ 5 और t ∶ u = 3 ∶ 5 हैं, तब (p – r)/(q – s) ∶ (r – t)/(s – u) का मान ज्ञात कीजिये।

1
3 ∶ 5
2
5 ∶ 3
3
1 ∶ 1
4
3 ∶ 8

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