No, generally 30 days is late. A late period can be caused by stress, sickness, too much dieting, and pregnancy. Not all periods are 28 days and can go as long as 35 day between periods. . If you are young and just starting your period it will take a year or so before it becomes regular. The same thing happens with menopause the periods become irregular because of hormones.
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It is 23 days, 16 hours and 48 minutes.
Less likely, but still possible. A woman can only get pregnant if she has sex either during ovulation or up to a week before ovulation when there is fertile quality cervical mucus present - this helps keep the sperm alive for up to 7 days and helps it to swim up through the cervical opening. During an average 28 day cycle a woman will be fertile between days 7-16 (ovulation on day 14, there can be a viable egg present for up to 48 hours) - by the time a woman menstruates the egg from the last cycle is long dead, and she cannot ovulate during menstruation. However if a woman's menstrual cycle is short she may ovulate soon after menstruation, thus if she was to have sex during her period sperm could survive up to 7 days, by which time she may have ovulated and thus she may get pregnant.
16 + 16 = 32 Or draw another way 16 16 + 32 ====
The answer is 16. 16*16=256, 256*16=4096
There are infinitely many sets. Consider the sets: {16}, {16, 16}, {16, 16, 16}, {16, 16, ... , 16} etc. It is easy to see that the mean, i each case, will be 16. Then, leaving aside the first set, add one to any number and subtract 1 from any number bigger than 1. The mean of this new set will also be 16. And you can keep going.