Find the unit digit in the product (4387)245 x (621)72
1
2
5
7
D.
7
Unit digit in (4387)245 = 7
Unit digit in (621)72 = 1
∴ Unit digit in the product of (4387)245 x (621)72 = 7 x 1 = 7
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