Which of the following number is divisible by 3?
631
730
949
123
If a and b are coprime numbers, their HCF=
ab
1
a+b
Which of the following is a coprime number?
(5,6)
(2,4)
(3,9)
(4,12)
What number should replace the star in 3*35 so that it may become divisible by 3
2
3
4
Prime factors of the smallest 3 digit number is
2 x 5
22 x 52
23 x 52
22 x 53
LCM of 11 and 5 is
16
55
None of these
Which of the following is a prime triplets?
{1,2,3}
{2,3,7}
{3,5,7}
{4,3,7}
A number is divisible by 5 if
sum of digits is divisible by 5
If the last digit of the number is 5
If the last digit of the number is 0
Either (2) or (3)
The factors of 15 are
1,3,5
3,5
3,5,15
1,3,5,15
Which of the following is a twin prime?
(7,11)
(2,3)
(3,11)
(11,13)
