Consider the pattern.
- What is the sum of Row 4?
- What is the sum of Row 25?
- If the sum is 1521, 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 4
= 4
2 = 4 x 4
= 16
(b)
Sum of Row 25
= 25
2 = 25 x 25
= 625
(c)
Row number = √(Sum of each row)
Row number with the sum 1521
= √1521
= 39
Answer(s): (a) 16; (b) 625; (c) 39
