If a and b are odd numbers, then which of the following is even?
a + b + ab
a + b - 1
a + b + 1
a + b + 2ab
What is the least number which when divided by 5, 6, 7, 8 gives the remainder 3 but is divisible by 9?
1463
1573
1683
1793
The HCF and LCM of two numbers are 12 and 924 respectively. Then the number of such pairs is
0
1
2
3
C.
2
Let the numbers be 12x and 12y, where x and y are prime to each other.
L.C.M. = 12xy
∴ 12xy = 924
⟹ xy = 77
∴ Possible pairs = (1, 77) (7, 11)