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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ss089

Using the limiting ranges: CN 3 for 0.155-0.225, CN 4 for 0.225-0.414, CN 6 for 0.414-0.732, CN 8 for 0.732-1.0, which statements are correct?

A $r_{+} / r_{-} = 0.50$ gives CN 4.
B $r_{+} / r_{-} = 0.30$ gives CN 4.
C $r_{+} / r_{-} = 0.80$ gives CN 8.
D $r_{+} / r_{-} = 0.20$ gives CN 3.

Answer: B, C, D

0.30 lies in 0.225-0.414 (CN 4); 0.80 lies in 0.732-1.0 (CN 8); 0.20 lies in 0.155-0.225 (CN 3). 0.50 lies in 0.414-0.732, which is CN 6, not 4.

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