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Q.

The unit digit of (795 – 358) is


Class: 10


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a

2

b

4

c

3

d

5 

answer is B.

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Detailed Solution

795 – 358
71 = 7
72 = 49
73 = 343
74 = 2401
75 = 16807
76 = 117649
77 = 823543
78 = 5764801
After 4 unit digit is repeating
So , remainder is 3
795 has unit digit = 3
31 = 3
32 = 9
33 = 27
34 = 81
35 = 243
36 = 729
37 = 2187
After 4 unit digit is repeated so  remainder 2 so unit digit of 358 = 9
Therefore (795 – 358) = (3 – 9) = (13 – 9)
= 4
  
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