POS and COS!!
Here are some compounds shown in the images.
- a denotes the no of compounds having * plane of symmetry. *
- b denotes the no of compounds having * center of symmetry. *
- c denotes the no of compounds having both * plane of symmetry * and * center of symmetry. *
- d denotes the no of compounds having none of the symmetries.
Find a b + b c + c d +d a.
The answer is 21.
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