Consider the pattern.
- What is the sum of Row 9?
- What is the sum of Row 20?
- If the sum is 2500, what is the row number?
(a)
Pattern for the sum of each row
Row 1: 1
2 = 1
Row 2: 2
2 = 4
Row 3: 3
2 = 9
Formula:
Sum of each row = (Row number)
2 Sum of Row 9
= 9
2 = 9 x 9
= 81
(b)
Sum of Row 20
= 20
2 = 20 x 20
= 400
(c)
Row number = √(Sum of each row)
Row number with the sum 2500
= √2500
= 50
Answer(s): (a) 81; (b) 400; (c) 50