CAT Exam

if a,a+2,a+4 are prime numbers,then the numbers of possible soultions for a is:
(1)one (2)two (3)three (4)more than three

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CAT Other Question

The remainder when (15^23+23^23) is divided by 19 is
(1)4 (2)15 (3)0 (4)18
How many letters of the english alphabet(capitals) appear same when looked at in a mirror