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(a) The fourth-proportional of 8, 10 and...

(a) The fourth-proportional of 8, 10 and 12 is _________ .
(b) The value of p when ` a/sqrt3 = b/sqrt5 = c/sqrt7 = (sqrt(3a) + sqrt(5b) - sqrt(7c))/p ` is ______ .

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The correct Answer is:
(a) 15; (b) 1 ;
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