Insert the missing number.
2, 6, 12, 20, 30, 42, 56, (....)
Choose the most appropriate option: A) 22 B) 38 C) 72 D) 66 E) 19
Explanation:   The pattern is 1 x 2, 2 x 3, 3 x 4, 4 x 5, 5 x 6, 6 x 7, 7 x 8.   So, the next number is 8 x 9 = 72.   Answer: 72) 72
<result>C</result>
Insert the missing number.
2, 6, 12, 20, 30, 42, 56, (....)