Question number one, the number 200,013 minus 2,013 is not divisible by which of the following numbers? So let's begin by subtracting and then we'll factor. So 200,013 minus 2,013 comes out to 198,000, which we factor as 198 times 1,000 and then continuing, 198 is 18 times 11, 1,000 we can write as 10 cubed and we have here a prime factorization 2 times 3 squared times 11 times 2 to the 3rd times 5 to the 3rd and we see that in our prime factors the number 7 does not appear so the number given is not divisible by 7 and the answer to number 1 is D.

divisibility

prime factorization

subtraction

mathematics

number theory