Which of the following is a twin prime?
(7,11)
(2,3)
(3,11)
(11,13)
Which of the following is a coprime number?
(5,6)
(2,4)
(3,9)
(4,12)
Two numbers are 15 and 45. Their HCF is 5. Find their LCM.
110
135
140
150
Number of factors of a prime number is?
1
2
3
4
Prime factors of the smallest 3 digit number is
2 x 5
22 x 52
23 x 52
22 x 53
If a and b are coprime numbers, their LCM=
ab
a+b
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)
LCM of 11 and 5 is
16
55
None of these
What number should replace the star in 3*35 so that it may become divisible by 3
LCM of 8 and 15
30
60
120
130