यदि p ∶ q = 2 ∶ 1; q ∶ r = 7 ∶ k; r ∶ s = 7 ∶ 5 और s ∶ p = 5 ∶ 2 है, तो k का मान ज्ञात कीजिये:

1
51
2
48
3
49
4
50

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