The number of distinct prime factors of the smallest 5-digit number is
(A) 2 (B) 4 (C) 6 (D) 8
The number of distinct prime factors of the largest 4-digit number is
(A) 2 (B) 3 (C) 5 (D) 11
Which of the following statements is not true?
(A) The HCF of two distinct prime numbers is 1
(B) The HCF of two co prime numbers is 1
(C) The HCF of two consecutive even numbers is 2
(D) The HCF of an even and an odd number is even
Sum of the number of primes between 16 to 80 and 90 to 100 is
(A) 20 (B) 18 (C) 17 (D) 16
Which of the following statements is not true?
(A) 0 + 0 = 0 (B) 0 – 0 = 0 (C) 0 × 0 = 0 (D) 0 ÷ 0 = 0
Which of the following statements is not true?
(A) Both addition and multiplication are associative for whole
numbers.
(B) Zero is the identity for muliplication of whole numbers.
(C) Addition and multiplication both are commutative for whole
numbers.
(D) Multiplication is distributive over addition for whole numbers.
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