Yes, an album can be number one more than once by falling and reaching number one again!
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If there is no single number that occurs more than once, either every number in the set is the mode or there is no mode - check with your teacher to see which answer he/she wants you to use.
9
There are 22 sums, if you don't include a number more than once. Where did you here a question like that?
No it isnt. The "-2" part is a whole number, but once you start tacking on more fragments and bits after the decimal point, you don't have a whole number any more.
2 and 5