In the given figure, find the missing term.

Pattern: in each sector, add the two outer numbers and multiply the sum by the previous integer.

• Top-right sector: 14 + 7 = 21, and 21 x 20 = 420.

• Bottom-right sector: 9 + 11 = 20, and 20 x 19 = 380.

• Bottom-left sector: 15 + 3 = 18, and 18 x 17 = 306.

For the missing sector, the inner number is 552. Since 24 x 23 = 552, the two outer numbers must add to 24.

One outer number is 6, so the missing number is 24 - 6 = 18.

Answer: 18