Friday, 21 October 2011

Puzzle-7 (APPSC-2011)

How many letters of the English alphabet (Capitals)appear same when looked at in a mirror:
(A) 9
(B) 10
(C) 11
Solution follows here:


A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z

To appear same when looked at in a mirror, the alphabet has to obey symmetry rule.

If we draw a vertical line midway of the letter, the left and right parts shall be mirror images to each other (assuming mirror placed at the line drawn)
This is represented in the following diagram:

We can clearly observe that, A obeys this and B does not obey
If we go by this, we can observe that the following 11 letters obey the rule:
A  H   I   M   O   T   U   V   W   X   Y

Note: 'Y' may be controversial here. Generally Y is written in a different way as 'Y',  in which case it won't obey the rule and answer will be 10 only 

Answer (B) or (C)

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