Which of the following statements regarding Pascal's triangle is true?
1) The sum of the numbers in each row is equal to 2ⁿ, where n is the row number.
2) The numbers in each row are the coefficients of the binomial expansion of (a + b)ⁿ, where n is the row number.
3) The first and last numbers in each row are always 1.
4) The triangle is named after the French mathematician Blaise Pascal.