ANSWERS: 2
  • If you continue the 1234...20 continuing the run of numbers for 20 rows the 20th number will be the number 400
  • If there are 20 rows of 20 numbers, the sum of all numbers in the 20th row is 7810. Explanation: Take the first and last number of the 20th row and add them and multply the result by 10. 381 + 400 = 781 * 10 = 7810 This works because there are 10 pairs that add up to 781. 382 + 399 383 + 398 ect.

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