The unit digit of[(25^43 \times 56^42) + 456^25 + 23^42 + 76^23] is -

RRB Group-D Model Paper 12 with answers for online practice

Question : 48 of 100

Marks: +1, -0

The unit digit of

[(25^43 × 56^42) + 456^25 + 23^42 + 76^23]

is -

Solution:

The unit digit of

25^43

is 5.
The unit digit of

56^42

is 6.
The unit digit of

456^25

is 6.
The unit digit of

23^42

is 9.
The unit digit of

76^23

is 6.
∴ The resultant value of the unit digits = [(5 × 6) + 6 + 9 + 6] = (30 + 6 + 9 + 6) = 51
So, the unit digit of the expression is 1.

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