Consider the pattern.
- What is the sum of Row 5?
- What is the sum of Row 26?
- If the sum is 441, 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 5
= 5
2 = 5 x 5
= 25
(b)
Sum of Row 26
= 26
2 = 26 x 26
= 676
(c)
Row number = √(Sum of each row)
Row number with the sum 441
= √441
= 21
Answer(s): (a) 25; (b) 676; (c) 21
