Sufficient & Necessary Conditions - Indicators

Question 1

If

Answer 1

The Rule: “if” introduces a sufficient condition. The other part of the statement is the necessary condition.

Question 2

When

Answer 2

The Rule: “when” introduces a sufficient condition. The other part of the statement is the necessary condition.

Question 3

Whenever

Answer 3

The Rule: “whenever” introduces a sufficient condition. The other part of the statement is the necessary condition.

Question 4

Where

Answer 4

The Rule: “where” introduces a sufficient condition. The other part of the statement is the necessary condition.

Question 5

Wherever

Answer 5

The Rule: “wherever” introduces a sufficient condition. The other part of the statement is the necessary condition.

Question 6

Only If/When/Where

Answer 6

The Rule: “only if” introduces a necessary condition. The other part of the statement is the sufficient condition.

Question 7

Only vs. the Only

Answer 7

The Rule: while “only” by itself always introduces a necessary condition, “the only” actually introduces a sufficient condition.

Question 8

If and Only If

Answer 8

The Rule: “if and only if” indicates that each variable is both a sufficient and a necessary condition. “If and only if” is diagrammed with a double arrow.

Question 9

All

Answer 9

The Rule: “all” introduces a sufficient condition. The other part of the statement is the necessary condition.

Question 10

Every/Each/Any

Answer 10

The Rule: “every” introduces a sufficient condition. The other part of the statement is the necessary condition.