For any two numbers a and b, a @ b = a + 2b and a # b = ab – 1. What is the value of (3 @ 4) # 2?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 21
Work out the bracket first with the rule for ‘@’, then use its result as the first number in the rule for ‘#’.
3 @ 4 \(=3+2\times4=11\)
11 # 2 \(=11\times2-1=21\)