3 1f p pa p 1s the canonical representation, then: ) -n1- din d (c) ()p¢ () (d) none of these 44 a positive integer a is called.. ... number if the sum of its p

3 1f P Pa P 1s the canonical representation, then: ) -n1- din d (C) ()p¢ () (D) None of these 44 A positive integer a is called.. ... number if the sum of its proper divisors is equal to a. (A) Fermat's (B) Euler's (C) Perfect (D) None of these 45 Which of the following is a perfect number ? (A) 6 (B) 7 (C) Both (A) and (B) (D) None of these 46 If n is an integer 2 2 such that 2" -1 is prime, then u= . .. 1S a perfect number, (A) 2-1 (B) 27- (C) 2-2"-1) (D) None of these 47 The congruence x = a (mod p) solvable, then it has exactly. Solution(s). (B) 1 (D) None of these (A) 0 (C) 2 48. If(a, b) = 1, then (A) a 2 = 1 (mod p) P (B) a 2 =-1 (mod p) P- p- (C) either a 2= 1 (mod p) or a 2 =-1 (mod p) (D) None of these XEH3)-MAT(8)B (9)