यदि 2(x + y) = xy, 4(x + z) = xz और (y + z) = yz है, तो (1 / x + 1 / y + 1 / z) का मान ज्ञात कीजिए।

1
7 / 8
2
4 / 3
3
3 / 5
4
8 / 9

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