Xth class Maths?

1 ⤊

Find the probability of 53 fridays in a leap year........
the answer may be 2/7 but i'm not sure how.

2006-09-20 02:51:04 · 2 answers · asked by reu_999 2 in Education & Reference ➔ Homework Help

2 answers

A leap year has 366 days.

52 weeks = 52 * 7 = 364 days, leaving 2 remaining days.

Both days cannot be Friday.

Therefore, the probabilty of the first day being Friday is 1/7.
The probability of the second day being Friday is 1/7 * the chance that the first day was not Friday, or 6/7.

Thus, the probability is 1/7 + 6/49 = 13/49.

2006-09-20 02:58:46 · answer #1 · answered by ³√carthagebrujah 6 · 1⤊ 0⤋

oh! gosh. don't scare me again, I have left that all in school.

2006-09-20 02:59:10 · answer #2 · answered by Anonymous · 0⤊ 0⤋