Based on the given number sums:
- If Row 2, (that is, 4 + 5 + 6 = 7 + 8) is said to have 5 numbers, and Row 3 has 7 numbers, how many numbers does Row 41 have?
- Which row has143 numbers?
(a)
Pattern for the total numbers in a row
Row 1: 1 x 2 + 1 = 3
Row 2: 2 x 2 + 1 = 5
Row 3: 3 x 2 + 1 = 7
Total numbers in a row = Row number x 2 + 1
Total numbers in Row 41
= 41 x 2 + 1
= 82 + 1
= 83
(b)
Total numbers in a row = Row number x 2 + 1
Row number = (Total numbers in a row - 1) ÷ 2
Row number which will have 143 numbers
= (143 - 1) ÷ 2
= 142 ÷ 2
= 71
Answer(s): (a) 83; (b) 71