Question

If 3 @ 4 = 19,5 @ 6 = 41, then what is 6 @ 7?

• A. 49
• B. 55
• C. 61
• D. 72

Answer 1

Answer:

B. 55

Let's identify the pattern.

Given:

• (3 @ 4 = 19)

• (5 @ 6 = 41)

Notice:

• $(3 \times 4 + (3 + 4) = 12 + 7 = 19)$

• $(5 \times 6 + (5 + 6) = 30 + 11 = 41)$

So the rule is:

a @ b = ab + a + b

Now calculate:

• $6 @ 7 = 6 \times 7 + 6 + 7 = 42 + 13 = 55$