Question : Direction: Select the correct combination of mathematical signs to replace * signs and to balance the following equation.
13 * 12 * 5 * 4
Option 1: =, –, +
Option 2: =, +, –
Option 3: +, –, =
Option 4: –, =, +
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Correct Answer: =, +, –
Solution :
Given:
13 * 12 * 5 * 4
Let's check the options —
First option:
=, –, +
On replacing → 13 = 12 – 5 + 4
⇒ 13 = 12 – 5 + 4
⇒ 13 = 16 – 5
⇒ 13 ≠ 11
Second option:
=, +, –
On replacing → 13 = 12 + 5 – 4
⇒ 13 = 12 + 5 – 4
⇒ 13 = 17 – 4
⇒ 13 = 13
Third option:
+, –, =
On replacing → 13 + 12 – 5 = 4
⇒ 13 + 12 – 5 = 4
⇒ 25 – 5 = 4
⇒ 20 ≠ 4
Fourth option:
–, =, +
On replacing → 13 – 12 = 5 + 4
⇒ 13 – 12 = 5 + 4
⇒ 1 ≠ 9
Hence, the second option is correct.
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