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The unit digit in the product (122)173 is
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- 2
- 4
- 6
- 8
Correct Option: A
21 = 2
22 = 4
23 = 8
24 = 16
25 = 32
Now As we know that,
Unit place of 21 = 2
Unit place of 22 = 4
Unit place of 23 = 8
Unit place of 24 = 6
Unit place of 25 = 2
i.e. 2 repeats itself after the index 4.
∴ Unit digit in the product of (122)173
= Unit digit in (122)1 = 2
(1 = remainder when 173 is divided by 4).
