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Question

The value of 13C7+13C8+13C9+13C10+13C11+13C12+13C13

A
212
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B
211
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C
213+12
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D
21312
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Solution

The correct option is A 212

13C7+13C8+13C9+13C10+13C11+13C12+13C13


=213(13C0+13C1+13C2+13C3+13C4+13C5+13C6)


Also,(13C0+13C1+13C2+13C3+13C4+13C5+13C6)=13C7+13C8+13C9+13C10+13C11+13C12+13C13


Therefore13C7+13C8+13C9+13C10+13C11+13C12+13C13=2132=212



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