Welcome to the Youtube live session of Data Sufficiency. The session starts with the basic lessons of GMAT DS, data sufficiency answer options, and tips and method to solve a typical DS question. The questions discussed on July 1, 2017 during the live session follow the embedded video. The video link next to each question will take you to the start of the part of the video where that specific question is discussed. Click the video embedded below to watch the entire session.
What is n?
Do not make unwarranted assumptions about what kind of a number is 'n'? If nothing is mentioned, the only possibility is that 'n' can be any real number.
Is x = 3?
Data is sufficiency if you get a conclusive answer? Note, in this question, we have to determine whether x equals 3. We need not find a value for x. There is a significant difference between the two when it comes to data sufficiency. If the statement gives a definite yes as answer, data is sufficient. If the statement gives a definite no as answer, data is sufficient.
Is x = 3?
Keep in mind that getting a conclusive NO as answer will mean that the data is sufficient.
If * is one of addition, subtraction, multiplication or division what is 7 * 0?
You have to get a conclusive answer for the question asked. You may or may not get a conclusive answer for questions asked at the intermediate stage.
What is the area of triangle ABC?
Sum of the two shorter sides of the triangle should be greater than the longest side of the triangle.
What is the area of triangle ABC whose perimeter is 30?
Check whether the statement(s) provide you with adequate information to determine whether the triangle under consideration is unique. If you zero it down to a unique triangle, the data is sufficient. If more than one triangle is possible with the given information, the data is not sufficient.
What is the area of triangle ABC?
It's not always Pythagorean triplets that form right triangles. Take a few moments to get clarity on which sides are perpendicular sides and which can be the hypotenuse before rushing to answer the question.
What is the value of the largest of five positive integers?
Check to see whether the question is asking for the maximum possible value of the largest number or the value of the largest number before settling for an answer option.
Is x^{3} > x^{2}?
The question tests your understanding of the four intervals in which different exponents of a number behave differently. The intervals to evaluate are (- ∞ -1), (-1, 0) (0, 1), and (1, ∞). Evaluate to check whether the statement(s) provide a conclusive yes or conclusive no.
Is the quadrilateral ABCD a parallelogram?
Solving this question involves two parts. Part 1: understanding the properties of different quadrilaterals including parallelogram. Part 2: Ability to look for a counter example and back it with properties of quadrilaterals.
What is the remainder when N is divided by 14?
It is possible to determine a unique remainder if the second divisor is a factor of the first one. However, there exist more than one remainder if the second divisor is a multiple of the first one.
If N is a positive integer, is N^{2} divisible by 48?
What should N^{2} contain if it has to be a multiple of 48. It has to be a multiple of 48 or its prime factorized equivalent, 2^{4} × 3. Evaluate the two statements to determine whether you can determine this information.
Is |a| > |b|?
Point 1: When will |a| be greater than |b| if a > b.
Point 2: What does it mean that the sum of two numbers is negative?
Is the positive integer P prime?
Statement 1: It requires knowing what Mersenne Primes are to conclusively determine whether statement A is sufficient. An examination alternative is to check with a few numbers that satisfy the condition in statement 1 and determine the answer to the question. Though, using a few numbers to determine sufficiency is not conclusive, in the absence of some specific knowledge, that is the best one can do.
Is the positive integer N divisible by 12?
If a number N does not contain a prime number P, then when the number of factors of PN will be twice the number of factors that N has. However, if N already has P as one of its prime factors, PN will have lesser than twice the number of factors that N has. How much lesser is determined by how high the power of the prime P in N. Greater the power, lower the value of the multiple.
Consider triangle ABC with AB = 6 cm. Which is the smallest side of this triangle?
Property Tested: Side opposite the smallest angle is the shortest side in a triangle.
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