Question

The unit digit in the product of 163 x 87 * x 239 be 1, then the digit that the place of will be ​

Answer 1

Answer:

now if we take unit digits of these three numbers then we get 3 × 9 × *

now, 3 × 9 = 27

it means the product we will get in unit place is 7 × *

but 7 × * get unit place as 1

if we multiply 7 × 3 we get 21 and unit place as 1

hence, * could be replaced by 3

Answer 2

Answer in the attachment

Hope it will be helpful for you dear :)