1 Intro

Question 1

What is a DS question?

Answer 1

Data sufficiency question

Question 2

What is specific about DS questions?

Answer 2

DS questions present you with a question stem that cannot be answered without additional information

Question 3

What do you have to determine in DS questions?

Answer 3

You are given two statements. Each of which provides information.

Your task is to determine whether the information provided in the two statements, either individually of in tandem is sufficient to answer the question.

Question 4

When is a statement sufficient?

Answer 4

A statement is considered sufficient when it can be used to definitively answer the question in the question stem.

Question 5

Q: “Is olaf more than 21 years old?

S1: “Olaf is older than Tsu, who is 10yo.”
S2: “Olaf is older than Sergio, who is 65yo”.

Answer 5

S1 does not provide the information needed to definitively answer the question, so S1 alone is NOT sufficient.

S2 is sufficient by itself.

Question 6

What are the 5 option answers to a DS question?

Answer 6

A-E

A + B = both where 1S is sufficient, and the other is not

C = both S are sufficient but only in tandem
D = each S alone is sufficient
E = both S are not sufficient

Question 7

If statement 1 is not sufficient by itself to answer the question, which answer prompts can be ruled out immediately?

Answer 7

A + D

Question 8

What are the 2 types of DS questions?

Answer 8

1) value question
2) yes/no question

Question 9

What is a “value question”?

Answer 9

Asks us whether we have sufficient information to determine the unique value of something

Question 10

What is a “yes/no question”?

Answer 10

Asks us whether we have enough information to determine a definitive value of something; a conclusive yes or a conclusive no

Question 11

Which type of DS question does this relate to: “Did Jyothi earn more than 100k in 2022?”

Answer 11

yes/no question

Question 12

Q: “Is Fay more than 10 yo?”

S1: Fay is 7yo
S2: Fay is older than 6y

Answer 12

S1 is enough.

Many students answer incorrectly as they think 7 < 10, so it must be incorrect. But if S1 tells you Fay is 7, she must not be 10. Therefore this gives you a definitive no answer and is a sufficient statement.

Question 13

Are you asked to calculate a numerical answer in DS questions?

Answer 13

NO!!!
You are just asked whether you can produce a unique answer

Question 14

Q: “How much money does Joe have?”

S1: Joe has 5 or 10
S2: Joe has 10 or 20

Answer 14

There is a single unique possible value shared by both statements! ($10)

= The two statements TOGETHER (c) would be the correct answer