SSC CPO SI and ASI Model Paper 1

Question : 116 of 200

Marks: +1, -0

The unit’s place digit of $129^121 + 78^67$ is

Solution:

(1) The unit’s place digit of

129^121

+ 7867 = Unit’s place digit of

129^121

+ Unit’s place digit of 78^67 = Unit’splace digit of

9^121

+ Unit’s placedigit of

8^67

= Unit’s place digit of

9^1

+ Unit’splace digit of

8^3

(since the order ofcycles of 9 and 8 are 2 and4, respectively)= Unit’s place digit of (9 + 2) = 1

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