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If ab=45 and bc=1516 , then c2-a2c2+a2 is :

7/5
7/25
7/125
7

Correct Answer: 7/25

Explanation:

$\frac{a}{b} \times \frac{b}{c} = \frac{4}{5} \times \frac{15}{16} = \frac{3}{4} = \frac{16 - 9}{16 + 9}$

= $\frac{7}{25}$

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