What conjecture can you make about the sum of the first 10 positive even numbers? . 2 =2 = 1 x 2. 2 + 4 = 6 = 2x3. 2+4+6 = 12 = 3x4. 2+4+6+8 = 20 = 4x5. 2+4+6+8+10 = 30= 5x6. . a] the sum is 9x10. b] the sum is 10x10. c] the sum is 11x12. d] the sum is 10x11