Q1. Let x e {2, 3, 4} and y e {4, 6, 9, 10}. Let A be the set of all order pairs (x, y) such combined defence service question that x is a factor of y. how many elements does the set A contains? (1) 12 (2) 10 (3) 7 (4) 6 Q2. Which one is the null set? (1) A = { x is a real number : x > 1 and x = 1 } (2) B = {x : x +3 = 3} (3) C = {F} (4) D = {x is a real number x = 1 and y = 1} Q3. If (x-6) is the HCF of x2 - 2x - 24 and x2 – kx - 6, then what is the value of K? (1) 3 (2) 5 (3) 6 (4) 8
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