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Question

There are 9 letters in the word: PROXIMITY. How many letters of this word won't undergoe lateral inversion in a plane mirror?

A
2
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B
5
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C
8
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D
7
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Solution

The correct option is D 7
The letters which have vertical axis of symmetry will remain unchanged under lateral inversion. Therefore, the letters X, O, M, I, T and Y are the 7 letters (I repeating twice) in total that won't be changed after reflection from a plane mirror.

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