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RAJKUMAR BHAGAT

· started a discussion

· 1 Months ago

tell me rules (Question:20273.0)

please elaborate

Question:
The unit digit in the product (122)173 is?
Options:
A) 2
B) 4
C) 3
D) 6
Solution:
Unit digit of (122)173 

= Unit digit of 2 [Remainder of (173-1/4)]+1

= Unit digit of (2)0+1

= Unit digit of (2)1

= 2

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