DEPRECATED Interpreting the structure of expressions

Problem

The formula for the sum of the first 50 even integers is given by
2+4+6++100=50(50+1)\qquad2+4+6+\cdots+100=50(50+1).
Which of the following is the correct formula for 2, plus, 4, plus, 6, plus, 8, plus, 10, plus, 12, plus, 14, question mark, space, space, space
Choose 1 answer:
Choose 1 answer:
Based on these cases, what is the sum of the first n even integers?
Do 4 problems