निम्नलिखित संख्याओं के किस युग्म में कोई भी संख्या अभाज्य संख्या नहीं है, लेकिन दोनों संख्याएँ सहअभाज्य हैं?

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RRB Technician Grade III Official Paper (Held On: 29 Dec, 2024 Shift 1)
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  1. (21, 35)
  2. (19, 27)
  3. (11, 17)
  4. (8, 25)

Answer (Detailed Solution Below)

Option 4 : (8, 25)
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प्रयुक्त सूत्र:

यदि दो संख्याओं का महत्तम समापवर्तक (GCD) 1 है, तो वे सहअभाज्य होती हैं।

गणना:

1) युग्म (21, 35)

21 = 3 x 7

35 = 5 x 7

GCD (21, 35) = 7

दोनों संख्याएँ सहअभाज्य नहीं हैं।

2) युग्म (19, 27)

19 एक अभाज्य संख्या है।

गलत।

3) युग्म (11, 17)

11 और 17 दोनों अभाज्य संख्याएँ हैं।

गलत।

4) युग्म (8, 25)

8 = 23

25 = 52

GCD(8, 25) = 1

8 और 25 दोनों अभाज्य संख्याएँ नहीं हैं।

दोनों संख्याएँ सहअभाज्य हैं।

∴ सही उत्तर विकल्प 4 है।

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