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Answer: Consecutive prime numbers. After 23 comes 29.
Answer: All except 21 are even numbers.
Answer: B and C are both children of A and D, so they are siblings.
Answer: Copper, Gold, Silver, and Lead are non-ferrous. Iron is ferrous.
Answer: My paternal grandmother\'s only son is my father. His wife is my mother.
Answer: All except 100 are perfect cubes. 100 is not a perfect cube.
Answer: Triangular numbers with differences 2, 3, 4, 5, 6. Next is 15 plus 6 equals 21.
Answer: Pythagoras: square root of 9 plus 16 equals 5 km.
Answer: Using same letter-to-digit mapping: R equals 7, giving 712348.
Answer: Each letter shifted by plus 1. MOON becomes NPPQ.
Answer: At 3:15 the minute hand is at 90 degrees, hour hand at 97.5 degrees. Difference is 7.5 degrees.
Answer: Each letter shifted by plus 2. CANDLE becomes EDRGLF.
Answer: Each group skips one letter. A-C-E, F-H-J, K-M-O, next is P-R-T.
Answer: Each letter shifted by plus 3. TREND becomes UWFKD.
Answer: After interchange A is 11th from front. Total equals 11 plus 9 minus 1 equals 19.
Answer: Each number doubles. 24 times 2 equals 48.
Answer: A is mother of B and C. E is B\'s daughter. C is uncle of E.
Answer: Each term times 2 plus 1. 47 times 2 plus 1 equals 95.
Answer: Mohan is taller than Ram who is taller than Shyam. Mohan is tallest.
Answer: Gap of plus 3 each time. J plus 3 equals M.