SSC IMD SA 2017 – Question 15

Question:

If 19 @ 7 = 6, 8 @ 2 = 3 and 10 @ 8 = 1, then what is the value of 18 @ 12 = ?

यदि 19@7=6, 8@2=3, 10@8=1, तो 18@12 = ? का मान क्या होगा?

Options:

  • 15
  • 9
  • 3
  • 4
  • 15
  • 9
  • 3
  • 4

Correct Answer: c)

Explanation:

Detailed Explanation:

This question is based on Custom Mathematical Operator Logic.

Let us determine the underlying operation for the symbol ‘@’ from the given examples:

  1. 19 @ 7 = 6:$$ rac{19 – 7}{2} = rac{12}{2} = 6$$
  2. 8 @ 2 = 3:$$ rac{8 – 2}{2} = rac{6}{2} = 3$$
  3. 10 @ 8 = 1:$$ rac{10 – 8}{2} = rac{2}{2} = 1$$

Clearly, the formula is:$$A ext{ @ } B = rac{A – B}{2}$$

Now applying this formula to 18 @ 12:$$18 ext{ @ } 12 = rac{18 – 12}{2} = rac{6}{2} = 3$$

Therefore, the value of $18 ext{ @ } 12$ is 3.

Correct Answer: c) 3

विस्तृत व्याख्या:

यह प्रश्न प्रतीकात्मक गणितीय संक्रिया (Symbolic Operation Puzzle) पर आधारित है।

दिए गए समीकरणों से संक्रिया ‘@’ का नियम ज्ञात करते हैं:

  1. 19 @ 7 = 6:$$ rac{19 – 7}{2} = rac{12}{2} = 6$$
  2. 8 @ 2 = 3:$$ rac{8 – 2}{2} = rac{6}{2} = 3$$
  3. 10 @ 8 = 1:$$ rac{10 – 8}{2} = rac{2}{2} = 1$$

स्पष्ट है कि नियम यह है: दोनों संख्याओं के अंतर को 2 से भाग देना, अर्थात:$$A ext{ @ } B = rac{A – B}{2}$$

अब यही नियम 18 @ 12 के लिए लागू करने पर:$$18 ext{ @ } 12 = rac{18 – 12}{2} = rac{6}{2} = 3$$

अतः अभीष्ट मान 3 है।

सही उत्तर: c) 3

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