Math

posted by .

Is .121221222122221... (the pattern in this number continues forever) a rational number or irrational number? Why?


(my research is listed in a previous question post, but I'm stuck!!! Please help!) :-)

  • Math -

    Each term 0.12, 0.00122, 0.000001222, 0.00000000012222, ...
    is a rational number. When continued forever and added together, it does not have to be a rational number.

    Another example:

    1, 1/3, 1/5, 1/7, 1/9, ... are all rational numbers.
    If we look at the sum
    S = 1 - 1/3 + 1/5 - 1/7 + 1/9 - ....
    S equals π/4, a known irrational number.

    In fact, a non-recurring decimal number is considered an irrational number.
    See:
    http://en.wikipedia.org/wiki/Irrational_number

  • Math -

    you have to put in the division,addition,sub., or whatever to answer this...(44,8,74,21,4)=10

  • Math -

    Camy,
    It is not a good idea to piggyback a question on someone else's question. It may get ignored or overlooked.
    As there are no replies yet, I suggest you repost the question as a new thread.
    Thank you.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Math

    What are irrational, rational, and natural numbers?
  2. math

    1. Which of the following numbers is an example of an integer?
  3. math

    What is the best sequence of names to identify this set of numbers?
  4. math- please help

    What is the best sequence of names to identify this set of numbers?
  5. 8th Grade Math

    Please help! Which statement is false? A. The number zero is a rational number. B. Some irrational numbers are also rational numbers. C. Every irrational number is a real number. D. Every integer is a rational number. I thinks its
  6. Math

    Which statement is false? A. The number zero is a rational number. B. Some irrational are also rational numbers. C. Every irrational number is a real number. D. Every integer is a rational number Is the answer C?
  7. MATH HELP PLEASE

    Which statment is false? A. The number zero is a rational number. B. Some irrational numbers are also rational numbers. C. Every irrational number is a real number D. Every integer is a rational number Is the answer C?
  8. Math Check Pleas Thank You

    1. Which of the following numbers is an example of an integer?
  9. Math-Measure's & area

    1. Find the area of a parallelogram with base b and height h. B=82cm H=16.6cm a.**1,361.2 cm^2 b.6,724 cm^2 c.137.78 cm^2 d.98.6 cm^2 2.Identify all the sets to which the number belongs. Choose from rational number, irrational number, …
  10. Math

    5. How would you change this sentence to a true statement?

More Similar Questions