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19 November, 14:18

Write 98 as a prouct of a prime factors

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  1. 19 November, 14:25
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    Ans 98 = 2x7x7

    Since 98 ends with an even digit, we can tell that it is divisible by 2:

    => 98/2 = 49

    Try possible factor prime:

    a. 49 end with odd digits so not divisible by 2

    b. The sum of its digits is 4+9=13, which is not divisible by 3, so 49 is not divisible by 3 either.

    c. 49 does not end with 5 or 0 so not divisible by that 2 numbers

    d. 49 divisible by 7 = > 49/7 = 7

    ===> 2x7x7

    * A prime number is a natural number greater than 1 that cannot be formed by multiplying two smaller natural numbers.
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