By Jeff J. Kolby, Derrick Vaughn

I loved the booklet - it's located as a Math path, yet i might say it's kind of too extreme. It jumps without delay into lovely excessive point and dense fabric, so the easiest use for this publication while you're aiming for a excessive quant ranking and prepared to sweat for it. while you are simply beginning out, i would most likely recommend to begin with Kaplan Math workbook after which seize this publication (Kaplan appeared to were laid out a piece larger, yet certainly now not as targeted and didn't contain a lot of likelihood, mixtures, records questions).

THE GOOD:
* most likely some of the most thorough GMAT quant books although occasionally a tad over the top
* Has sturdy assurance of unique query forms: likelihood, information, combos, fuctnions, counting, etc
* Questions prepared in effortless, Medium, not easy sections - you could bypass immediately to the more durable questions or vice versa
* a few process elements
* Diagnostic attempt within the book
* facts sufficiency perform (about a hundred questions)
* a whole lot perform questions and a good proportion of not easy ones

THE BAD:
* now not a ebook for newbies and assumes familiarity with easy recommendations and layout of the try out; has a possible to frustrate someone who's simply moving into it
* 500+ pages - effortless to get slowed down and will take fairly your time to cover
* doesn't indicate which goods are critical/most very important to remember
* dependent in a marginally unorthodox model (pretty a lot starts off with symbol-type questions after which jumps to Geometry)
* doesn't support spot a number of the more uncomplicated ideas, yet as a substitute does a head-on procedure (which is maybe extra trustworthy, yet takes time)
* Has a couple of sections that won't be extremely important for the GMAT equivalent to Graphs and Charts

Overall, stable 500+ web page math publication and if not anything else, is an effective selection of questions.
Let me comprehend when you have any questions about this book,

BB, GMAT 750
Founder of GMAT membership

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Additional resources for GMAT Math Prep Course

Example text

A number n is odd if the remainder is one when n is divided by 2: n = 2z + 1. 30 Number Theory  The following properties for odd and even numbers are very useful—you should memorize them: even  even = even odd  odd = odd even  odd = even even + even = even odd + odd = even even + odd = odd Example 2: If n is a positive integer and (n + 1)(n + 3) is odd, then ( n + 2)(n + 4) must be a multiple of which one of the following? (A) 3 (B) 5 (C) 6 (D) 8 (E) 16 (n + 1)(n + 3) is odd only when both (n + 1) and (n + 3) are odd.

Now, 85/14 = 6 + 1/14. The remainder is 1, not x + 7 (= 8). Reject. Choice (E): 100/7 = 14 + 2/7, so x = 2. Now, 100/14 = 7 + 2/14. The remainder is 2, not x + 7 (= 9). Reject. The answer is (B). 11. 5. 5 = Choice (A). Reject choices (A) and (B). 5 = Choice (A). Reject choice (C). 5 = Choice (A). Reject choice (D). 8. Correct. The answer is (E). 12. Since each of the two integers a and b ends with the same digit, the difference of the two numbers ends with 0. For example 642 – 182 = 460, and 460 ends with 0.

Reject. If q = 42, p = 46 – 42 = 4, not a multiple of 5. Reject. If q  49, p  46 – 49 = –3, not positive either. Reject. So, we have only one acceptable assumption and that is n = 3 and therefore m = 5. Hence, mn = 3  5 = 15. The answer is (A). 24. The numbers 102 and 210 are themselves multiples of 3. Also, a multiple of 3 exists once in every three consecutive integers. Counting the multiples of 3 starting with 1 for 102, 2 [= 1 + (105 – 102)/3 = 1 + 1 = 2] for 105, 3 [= 1 + (108 – 102)/3 = 1 + 2 = 3] for 108, and so on, the count we get for 210 equals 1 + (210 – 102)/3 = 1 + 36 = 37.

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