SSC CHSL Model Paper 17

Question : 71 of 100

Marks: +1, -0

Find the unit’s digit in

12^55/3^11 + 8^48/16^18

Solution:

12^55/3^11 + 8^48/16^18

={3^55 . 4^55}/3^11+{4^48 . 2^48}/4^36

=3^44 . 4^55 + 4^12 . 2^48

divide power by 4

3^4 . 4^3 + 4^4 . 2^4

1 × 4 + 6×6 = 4 + 36

= 0 unit digit

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