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4
Great tips, thanks!
Great tips….so helpful! thanks! 🙂
Amazing!!!!!! Loved it! I remember the second ques and i remember how frustrated i was for not getting it in 2 mins time! Amazing outlook to solve questions like this.
Great explanation!!! thank you:)
It really helps.. Thank you very much for your tip 🙂
You don’t really need to apply explicitly prime factorization in the above questions.
I solved both the questions without even thinking of the word prime factor. My thought process was like this:
Q1: Take x as 6a and y as 14b. The product is 84ab. Having x as a multiple of 9 would mean xy would be 84ab * 9, which cannot be a multiple of 105 since it doesnt end with 5 or 0. If is a multiple of 25, that means xy is 84*25ab, which is a multiple of 7 and 15 (7*15 = 105). Hence b is sufficient.
For the second question, my thought process veered towards using the word product. Given that red has 7 points, I just started dividing 147000 by 7 and got 21000, which I again divided by 7 and got 3000, which cannot be further divided by 7. Hence, the answer is 2 red beads.
Please note that even though I did not use prime factors explicitly, my knowledge of multiplication and factors in general helped me answer this. By using prime factors, you are just making it more systematic.
nice post by admin thnx join http://www.urduchats.com