Question

If 2 @ 3 = 25 and 3 @ 4 = 49, what is 4 @ 5?

• A. 81
• B. 100
• C. 121
• D. 91

Answer 1

Answer:

A. 81

Let's find the pattern:

Given:

• 2 @ 3 = 25

• 3 @ 4 = 49

Notice:

• (2 + 3 = 5), and $(5^2 = 25)$

• (3 + 4 = 7), and $(7^2 = 49)$

So the rule is:

a @ b =$(a + b)^2$

Therefore:

4 @ 5 $= (4 + 5)^2 = 9^2 = 81$

Answer: 81.