Question
Find the missing number?
A. 6
B. 7
C. 8
D. 5
Answer: D
Solution:
Sum of the squares of 1st two columns = Squares of 3rd column
1st Row
3² + 4² = 5²
=> 9 + 16 = 25
=> 25 = 25
L H S = R H S
2nd Row
6² + 8² = 10²
=> 36 + 64 = 100
=> 100 = 100
L H S = R H S
3rd Row
7² + 24² = 25²
=> 49 + 576 = 625
=> 625 = 625
L H S = R H S
4th Row
12² + ?² = 13²
=> 144 + ?² = 169
=> ?² = 169 -144
=> ?² = 25 , Taking square root on both sides
? = 5