Question : Directions: By interchanging the given two numbers (not digits) which of the following equations will not be correct?
5 and 6
Option 1: 6 × 8 – 5 × 4 = 16
Option 2: 5 × 2 – 4 + 6 = 13
Option 3: 5 – 3 × 6 + 4 = –3
Option 4: 6 – 5 + 2 = 1
Correct Answer: 5 – 3 × 6 + 4 = –3
Solution :
Given:
5 and 6
Let's check the options –
First option:
6 × 8 – 5 × 4 = 16
On interchanging the numbers, we get –
= 5 × 8 – 6 × 4
= 40 – 24
= 16
Second option:
5 × 2 – 4 + 6 = 13
On interchanging the numbers, we get –
= 6 × 2 – 4 + 5
= 12 – 4 + 5
= 13
Third option:
5 – 3 × 6 + 4 = –3
On interchanging the numbers, we get –
= 6 – 3 × 5 + 4
= 6 – 15 + 4
= –5 ≠ –3
Fourth option:
6 – 5 + 2 = 1
On interchanging the numbers, we get –
= 5 – 6 + 2
= 1
Hence, the third option is correct.
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