How many letters of the word 'EXAMINATION' remain unchanged when the word is seen after reflection

Eight letters

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Six letters

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Nine letters

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Five letters

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Solution

The correct option is A Eight letters
The letters which have a vertical axis of symmetry will remain unchanged under lateral inversion. Therefore, the letters X, A, M, I, T, and O are the 8 letters(A and I repeating twice) in total that won't be changed after reflection from a plane mirror.

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How many letters of the word "EXAMINATION" are not changed when the word undergoes lateral inversion?

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