If 34 ! 68 = -170 and 9 ! 62 = -265, then what is the value of 3 ! 42?
Show answer & explanation
Correct answer: B
Explanation
Just as
34! 68
34 − 68 = -34
-34 × 5 = -170
and
9! 62
9 − 62 = -53
-53 × 5 = -265
Rule = a!b=(a−b)×5
Similarly
3! 42
3 − 42 = -39
-39 × 5 = -195
Correct answer: -195