**1141. n/m means that n is factor of m, then the relation’/’ is:**

A. Symmetric

B. Reflexive**C. Transitive and reflexive ***

D. Equivalence

**1142. Let r be a relation defined as a r b if /a/<b. Then relation r is :**

A. Reflixive

B. Symmetric**C. Transitive ***

D. Reflixive and symmetric

**1143. Let r is be a relation defined as arb if ab +1>0. Then relation r is :**

A. Reflexive

B. Symmertic

C. Transitive**D. Reflexive and ****symmetric**** ***

**1144. Number of non-empty subsets of the set {1,2,3,4} is :**

**A. 15 ***

B. 16

C. 17

D. 14

**1145. The relation ‘ less than’ in the set of natural number is :**

A. Only symmetric **B. Only transitive ***

C. Only reflexive

D. None

**1146. The union of all positive even and all positive add integer is :**

**A. N ***

B. W

C. Z

D. Z+

**1147. Which binary operation is not defined in the set of natural number :**

A. Addition**B. Subtraction ***

C. Multiplication

D. None

**1148. Which of the following is not a group of w.r.t addition :**

**A. N ***

B. Z

C. Q

D. R

**1149. Which of the following is a group w.r.t multiplication :**

A. Z

B. Q**C. Q-{0} ***

D. R

**1150. G = { 1,3,5,7} is a group .w.r.t multiplication modulo 8. Then ****inverse**** of 5 is :**

A. 1/5**B. 5 ***

C. 7

D. 3