MedianThe middle value that separates the greater and lesser halves of a set.
To find the median, first arrange the terms in a set in increasing (or decreasing) order.If the number of terms in the set is odd, the median is [(n + 1)/2]th term.If the number of terms in the set is even, the median is the mean of (n/2)th term and (n/2 + 1)th term.
In DS, beware of "exceptions".
Q. Is X positive?(1) |X| = X.
Because of the exception "X = 0" case, this statement is insufficient.
"Circular Reasoning"- The fallacy of assuming a conclusion to be true, in reaching the conclusion.
A favorite GMAT CR fallacy.
Example: Jack cannot lie because Jack always tells the truth.Example: A is true because B is true; B is true because A is true.
Don't leave mocks for the end- it's a common mistake.Take a mock every week.
Schedule your GMAT (only) once you get your target score on 3 consecutive mocks!
Permutation is used when ‘order’ matters.Example: Arranging children in a row.
Combination is used when ‘order’ does not matter.Example: Selecting teams.
Approach for solving SCs:
1. Read the mother sentence.2. For underlined part, move to answer choices.3. Compare vertically to observe the difference in the choices.4. Eliminate 4 choices through vertical comparison while reading horizontally.5. Read the sentence end-to-end before marking an answer choice.
Be cautious when you see extreme tonality on a CR question or answer choices.Example: must, most, highest, lowest, worst, best etc
- Often, the key to elimination/selection of an answer choice lies in such extreme terms.
Don't exhaust official material early- it's a common mistake.Save it for the last few weeks.
Don't leave mocks for the end- it's a common mistake.Take a mock every week.
"simple tenses" are the "default tenses".
Other tense forms are meant for specific uses.
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"Confusing-cause-with-effect"
A favorite GMAT CR fallacy.
Example: Every time I dream, I sleep.
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