Which of the following are twin prime numbers.
2,7
31,51
191, 193
193, 197
What these numbers 16 = 2 x 2 x 2 x 2 ; 15 = 3 x 5 denote?
Primes
Relatively primes
Twin primes
Composite
Even prime is
2
4
10
100
Sum of the first seven odd numbers is
25
36
40
49
If a ÷ b = c; where c is the natural number, then
a = b.c
b = a.c
a = b ÷ c
b = a ÷ c
If the sum of factors of a number is twice the number then it is called
Relatively prime
Even
Odd
Perfect number
Number of factors for 48.
6
8
LCM of 60 and 72 is
360
120
60
480
1000 - 452 is ________ number.
Prime
None of these
GCD of 45 and 63 is
77
9
11
3
