Four number in an increasing A.P., are such that the product of \( 2^{\text {nd }} \) and \( 3^{...

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Four number in an increasing A.P., are such that the product of \( 2^{\text {nd }} \) and \( 3^{\text {rd }} \) number is \( \frac{3}{2} \) times the product of extremes. The sum of these numbers is 50 . The first number is
a. 18
b 16
c. 15
d. 5
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