If x^{2} = 841 then x =
21
27
29
31
The value of √5 × √45 is
5
9
10
15
√2 is
A rational number
An irrational number
A composite number
A prime number
The subtraction of an integer is equivalent to ______ of the inverse of the integer.
Addition
Subtraction
Multiplication
Division
The square root of 2^{8} is
2^{6}
2^{4}
2^{2}
2
The period of is =
25
125
The predecessor of - 6 is ______.
-7
7
-5
The recurring part of the non - terminating recurring decimal is called _____.
Periodicity
Period
Neither a nor b
None of these
If A : B = 7: 9 and B : C = 3: 5, then A : B : C is.
7 : 9 : 5
21 : 35 : 45
7 : 9 : 15
7 : 3 : 15
A non empty set, which satisfies closure property, associative property, identity property and inverse property
is called a
Field
Abelian group
Group
Ring