Question

The unit digit of the product 123 x 457 x 121
(b) 1 (c) 2
(d) 3​

Answer 1

Answer:

1

Step-by-step explanation:

Unit digit will be determined by the product of unit digits of the given numbers.

Unit digit of 123x457x121 = unit digit of 3 x 7 x 1

                             = unit digit of 21

                             = 1

Therefore the unit digit of 123 x 457 x 121 is 1.

Suppose of any numbers ab, cd.

These can be written as 10a + b and 10c + d.

Since 10a and 10c are multiples of 10, their will always end with 0, hence unit digit depends only on the product of other terms(b and d).

That is why, unit digit depends only on the product of unit digits.

Answer 2

Answer:

1

Step-by-step explanation:

BECAUSE

3 × 7 × 1 = 21

its unit place is 1