18* 2 * 4 * 5 which alternative substitutes the stars?

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DSSSB Pharmacist 2014: Previous Year Paper
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  1. +, -, × 
  2. -, =, × 
  3. ÷, =, +
  4. ×, =, -

Answer (Detailed Solution Below)

Option 1 : +, -, × 

Detailed Solution

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Given equation: 18 * 2 * 4 * 5

BODMAS Table:

qImage14137

Let's check each option one by one.

Option 1) +, -, ×

Given: 18 * 2 * 4 * 5

After replacing the * signs we get;

18 + 2 - 4 × 5

⇒ 20 - 4 × 5

20 - 20 = 0

Option 2) -, =, × 

Given: 18 * 2 * 4 * 5

After replacing the * signs we get;

18 - 24 × 5

⇒ 16 ≠ 20

Option 3) ÷, =, +

Given: 18 * 2 * 4 * 5

18 ÷ 2 = 4 + 5

⇒ 9 = 9

After replacing the * signs we get;

Option 4) ×, =, -

Given: 18 * 2 * 4 * 5

18 × 2 = 4 - 5

⇒ 36 ≠ -1

Hence, the correct answer is "Option 3".

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