Question

The unit digit in the final solution when, 13*27*63*51*98*46 is _____ .

• A. 4
• B. 8
• C. 2
• D. none of the above

Answer 1

The Correct Option is A

To find the unit digit of the product 13 * 27 * 63 * 51 * 98 * 46, we should focus only on the unit digits of these numbers:

1. 13 has unit digit 3
2. 27 has unit digit 7
3. 63 has unit digit 3
4. 51 has unit digit 1
5. 98 has unit digit 8 
6. 46 has unit digit 6

Now, multiply these unit digits:
3 (unit digit of 13) * 7 (unit digit of 27) = 21, unit digit is 1.
1 (from previous step) * 3 (unit digit of 63) = 3, unit digit is 3.
3 (from previous step) * 1 (unit digit of 51) = 3, unit digit is 3.
3 (from previous step) * 8 (unit digit of 98) = 24, unit digit is 4.
4 (from previous step) * 6 (unit digit of 46) = 24, unit digit is 4.

The unit digit of the entire product is therefore 4.