Q.) The last two-digits in the multiplication
122 X 123 X 125 X 127 X 129 will be
One way is to multiply all the given number (Brute force method) and this would give you the last two digits.
Here , one of the number is a multiple of 5 and the other is a multiple of 2.
122 X 125 = 15250 lasts with 50 as last two digits.
This multiplied by odd numbers will always give 50 as the last two digits.
Hence , Option(b)