खालील 1 ते 20 या नैसर्गिक संख्यांच्या यादीत लगतच्या जोडीची बेरीज मूळ संख्या आहे. यादी अभ्यासा आणि त्यासंबंधीचे चुकीचे विधान निवडा.
20, A, 16, 15, 4, B, 12, C, 10, 7, 6, D, 2, 17, 14, 9, 8, 5, 18, E

The correct answer is Option A (Value of alphabet D changes according to value of B.).

Key Points:
• The list contains all natural numbers from 1 to 20 without repetition, and every adjacent pair sums to a prime number.
• The numbers already present in the list are: 2, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 16, 17, 18, 20.
• The five missing numbers corresponding to alphabets A, B, C, D, E are 1, 3, 11, 13, 19.
• Determining values:
• For A: Adjacent to 20 and 16. (20 + A) and (A + 16) must be prime. If A = 3, 20 + 3 = 23 (prime) and 3 + 16 = 19 (prime). Thus, A is definitely 3.
• For E: Adjacent to 18. 18 + E must be prime. The remaining available numbers are 1, 11, 13, 19. 18 + 13 = 31 (prime), while 18+1=19, 18+11=29, 18+19=37. But looking at 10 and 6 around D: D is between 6 and 2. 6 + D and D + 2 must be prime. For D = 11, 6 + 11 = 17 and 11 + 2 = 13 (both prime). No other number works for D (6+1=7 but 1+2=3; then for C next to 10 and 12, 12+C and C+10 need C=1 or 7, etc.). Here D is uniquely fixed as 11.
• Since D does not change based on B, statement (1) 'Value of alphabet D changes according to value of B' is false.
• Key Takeaway: D has a fixed value of 11 to satisfy primality with 6 and 2; hence the statement that D changes with B is false.