A) 2
B) 6
C) 9
D) 12
Correct Answer: B
Solution :
\[{{H}^{1}}{{H}^{1}},\ {{H}^{1}}{{H}^{2}},\ {{H}^{2}}{{H}^{2}},\ {{H}^{3}}{{H}^{3}},\ {{H}^{2}}{{H}^{3}}\]
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