最新GMAT综合推理题解题思路汇总
2019-04-09     13:52 来源: 来自互联网
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  IR也就是综合推理部分,是GMAT相对较新的一种题型。由于过去的老题目题量较小,导致了很多同学由于缺乏平时足够的练习,所以在这一类题目上很吃亏。那么我们就一起来做几道。多做多练才能提高!

  现在跟大家分析一下解题思路:

  Answers

  1. Three-of-a-kind = A outscores B

  Full House = A does not outscore B

  Four-of-a-kind = A does not outscore B

  2. C

  3. B

  4. first row = T does not outscore S

  second row = T outscores S

  third row = T outscores S

  Explanations

  1) Player A draw three-of-a-kind (worth 60 points), and does not discard, so A’s hand is worth 60 points. In all three cases, B discards two cards, for a reducing factor of 1/6.

  (a) B’s final hand = three-of-a-kind, which is (60)*(1/6) = 10 points. A outscores B.

  (b) B’s final hand = Full House, which is (720)*(1/6) = 120 points. A does not outscore B.

  (c) B’s final hand = Four-of-a-kind, which is (3600)*(1/6) = 600 points. A does not outscore B.

  It wasn’t relevant in any of these scenarios, but notice the exact wording — if A and B were tied, the answer would be “A does not outscore B.”

  2) Player J, with two pair and no discards, has 36 points. Player K, with three-of-a-kind and no discards, has 60 points. We want a combination worth more than 30 points but less than 60 points.

  (A) discard 1 card, three of a kind = (60)*(1/2) = 30. Less than 36, no good.

  (B) discard 2 cards, flush = (540)*(1/6) = 90. Higher than 60, no good.

  (C) discard 2 cards, straight = (300)*(1/6) = 50. This could work.

  (D) discard 3 cards, full house = (720)*(1/10) = 72. Higher than 60, no good.

  (E) discard 4 cards, full house = (720)*(1/60) = 12. Less than 36, no good.

  (C) is the only hand & discard combination that is in the required range.

  3) The five original cards in Player G’s hand are: 2 of Clubs, 5 of Diamonds, 8 of Hearts, 8 of Spades, and King of Diamonds. Player G discards the 2 of Clubs and 5 of Diamonds, leaving two 8’s and a king. We know that Player G’s reducing factor for this hand will be 1/6.

  The highest possible hand would be four-of-a-kind, in the unlikely scenario that G picked up the other two 8’s. That would result in (3600)*(1/6) = 600 points, the maximum.

  The lowest possible hand would be if G picks up garbage and just has the two 8’s. That would result in (12)*(1/6) = 2 points, the minimum.

  The range of any set is the max minus the min. Range = 600 – 2 = 598.

  Answer = (B)

  4) Player S’s hand is worth 300 points. That’s fixed. Now, we have to compare T to that 300 point total. discard 4 of Diamonds & 7 of Clubs, winds up with a flush

  Scenario #1: discard 4 of Diamonds & 7 of Clubs, winds up with a flush. Flush is worth 540, times the reducing factor of 1/6, for a point value of 540*(1/6) = 90, which is less than S. Player T does not outscore player S.

  Scenario #2: discard 6 of Hearts, winds up with a full house. Full house is worth 720, times reducing factor of 1/2, for a point value of 720*(1/2) = 360, which beats S. T outscores S.

  Scenario #3: discards 4 of Diamonds & 4 of Hearts & 6 of Hearts, winds up with four-of-a-kind. Four-of-a-kind is worth 3600, times a reducing factor of (1/10), for a point value of 3600*(1/10) = 360, which beats S. T outscores S.

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