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प्रश्न
If 9, x, x 49 are in proportion, find the value of x.
उत्तर
Given: 9:x::x:49
We know:
Product of means = Product of extremes
x × x = 9 × 49
⇒ x2 = 441
⇒ x2 = (21)2
⇒ x = 21
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