Necessary Vs Sufficient

Question 1

Always

Answer 1

Necessary

Question 2

Term associated with if (regardless of where it appears in the sentence)

Answer 2

Sufficient

Question 3

No/no one

Answer 3

Put the negative term (ie no one was injured) on the necessary (right) side of the arrow

Question 4

Mutually exclusive relationships mean what?

Answer 4

Including one thing excludes the other; either one or the other. An example: no lions are birds. This is how you translate a “no” or “no one” statement.

Question 5

Only/only If

Answer 5

Necessary

Question 6

THE only

Answer 6

Sufficient

Question 7

Every

Answer 7

Necessary

Question 8

Unless

Answer 8

Depends. Turn into an arrow to establish necessary and then negating the sufficient term (won’t, no, etc.)

Question 9

If, but only if,

Answer 9

Necessary AND sufficient (need two statements)

Question 10

Whenever

Answer 10

Sufficient

Question 11

Unless (approach #2)

Answer 11

Turn it into an “if ~”, which creates a negative sufficient term (if x hasn’t/isn’t)

Question 12

Any, all, every

Answer 12

Sufficient

Question 13

If, and only if means the same thing as what statement?

Answer 13

If, but only if