The answer is 3. Check my breakdown below.
Row 1:2×3=6
6×3=18 So the pattern in this row is multiplying by 3.
Row 2:4×5=20
20×5=100 for the pattern in this row we multiply by 5.
Row 3: Following the pattern, we see that 21×7=147.
So, the pattern in this row is multiplying by 7.
To find the missing number (?), we need to find what number multiplied by 7 equals 21.
?×7=21
?=21÷7
?=3
We can also check the relationship between the columns:
Column 1 to Column 2: 2×3=6, 4×5=20, ?×7=21 (so ?=3)
Column 2 to Column 3: 6×3=18, 20×5=100, 21×7=147
Both methods confirm the pattern.
The missing number is 3.
For more solutions to mathematical and intellectual/academic problems, follow me @africanacademia
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