RRB NTPC 28 April 2016 Paper

Question : 26 of 100

Marks: +1, -0

Find the unit digit in

(1234)^102

(1234)^103

Solution:

(3) Unit digit of

\{ ( 1234 ) ^ { 102 } +

( 1234 ) ^ { 103 } \}

=

Unit digit of

( 4^102 + 4^103 )

=

Unit digit of

\{ 4^102 ( 1 + 4 ) \}

=

Unit digit of

( 4^102 × 5 )

=

Unit digit of (even number

× 5 )

= 0

Go to Question:

Prev Question

Next Question