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प्रश्न 31   यदि log₃ y = x तथा log₂ z = x तब 72ˣ बराबर है -
 (अ) yz
 (ब) y²z²
 (स) y²z³
 (द) y³z²

उत्तर : y²z²

प्रश्न 32   समीकरण (4x+17)/18 - (13x-2)/(17x-32) + x/3 = 7x/12 - (x + 16)/36 का हल है -
 (अ) x = -4
 (ब) x = 4
 (स) x = 1/4
 (द) x = -1/4

उत्तर : x = 4

प्रश्न 33   (a - b)/(a + b) एवं a²b²/(a² - b²) का मध्यानुपाती है -
 (अ) ab/(a - b)
 (ब) ab/(a + b)
 (स) (a - b)/ab
 (द) (a + b)/ab

उत्तर : ab/(a + b)

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