GMAT: Data sufficiency 37 | Data sufficiency | GMAT | Khan Academy

TL;DR

GMAT problem 143 discusses the sufficiency of given statements to answer a question, while problem 144 involves inequalities with exponents.

Transcript

Before I go on with problem 143, I actually have a bone to pick with problem 142. We actually went through it correctly, although I probably did a couple of more steps then I had to. Because when I do them in real time my brain wanders. But now that I've had time to sit and look at it a little bit, I realize that I think the GMAT people may have ma... Read More

Key Insights

• ⁉️ The GMAT may have phrased the question incorrectly in problem 143, as statement 2 is sufficient to answer the question about the equality.
• 😀 In problem 144, statement 1 is sufficient if n is greater than 2, while statement 2 is equivalent to the original inequality.

Questions & Answers

Q: Is statement 2 in problem 143 sufficient to answer the question about the equality of 9 to the x plus 9 to the minus x and b?

Yes, statement 2 is sufficient because if b is equal to 0, the equation 9 to the x plus 9 to the minus x equals 0 is not possible.

Q: Are both statement 1 and statement 2 in problem 144 individually sufficient to solve the inequality 1/10 to the n less than 0.01?

Yes, both statement 1 and statement 2 are individually sufficient. Statement 1 is sufficient if n is greater than 2, and statement 2 is equivalent to the original inequality.

Summary & Key Takeaways

• Problem 143: The video discusses whether statement 2 is sufficient to answer the question about the equality of 9 to the x plus 9 to the minus x and b, ultimately concluding that statement 2 is sufficient, but the GMAT phrased the question incorrectly.

• Problem 144: The video analyzes whether statement 1 and statement 2 are individually sufficient to address the inequality 1/10 to the n less than 0.01, and concludes that both statements are sufficient.