Yes, 1234567890 is a real number.
If you put any numbers together it makes yet another number.
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1 plus 1234567890 is 1234567891
35136.41829
Since the imaginary portion of a real number is zero, the complex conjugate of a real number is the same number.
Oh, what a happy little question! With the digits 1-9 and 0, you have 10 options for each digit in a 4-digit number. So, you can form 10 x 10 x 10 x 10 = 10,000 different 4-digit numbers. Isn't that just delightful? Just imagine all the beautiful combinations you can create!
yes. an irrational number is any real number that is not a rational number