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)
Which of the following is a twin prime?
(7,11)
(2,3)
(3,11)
(11,13)
Which of the following number is divisible by 9?
631
729
949
223
If the last digit of a number is even or 0, then the number is divisible by?
2
3
5
6
If a and b are coprime numbers, their HCF=
ab
1
a+b
What is the relation between H.C.F and L.C.M of two natural numbers.
product of two given numbers = product of their L.C.M and H.C.F
sum of two given numbers = product of their their L.C.M and H.C.F
Difference of two given numbers = product of their their L.C.M and H.C.F
None of these
LCM of 11 and 5 is
16
55
If a and b are coprime numbers, their LCM=
The factors of 15 are
1,3,5
3,5
3,5,15
1,3,5,15
