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  1. Find the mean proportional between 100 and 625.
    1. 350
    2. 225
    3. 250
    4. 275
Correct Option: C

Let the mean proportional be x.
∴  100 : x : x : 625

Then ,  
100
 =
x
x625

⇒  x2 = 100 × 625
⇒  x = √100 × 625 = 10 × 25
= 250


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