Why the friday the 13th is unlucky?

Question

i'll just want to know

Answer 1

that is exactly right, what was said above me, and did you know that the fear of the number 13 is called 'triskadekaphobia' ?

Answer 2

In numerology, the number twelve is considered the number of completeness, as reflected in the twelve months of the year, twelve recognized signs of the zodiac, the twelve tribes of Israel, the twelve Apostles of Jesus, etc., whereas the number thirteen was considered irregular, transgressing this completeness. There is also a superstition, thought by some to derive from the Last Supper, that having thirteen people seated at a table will result in the death of one of the diners.

Friday, as the day on which Jesus Christ was crucified, has been viewed both positively and negatively among Christians.

Other than this there are also alot of other event saying that friday the 13th is unlucky as bad thing mostly happen on that day...