He can see the rainbow , only if it rains ,
(a) He saw the rainbow
(b) He can not see the rainbow
(c ) It rained
(d) it did not rain

Options

A. ac
B. bd
C. ca
D. ad

Answer

A

Explanation

The implications of only if p then q are `q rArr p and - p rArr - q `
`:.` The correct implications will be ac and db