Answer / swapnil

2 power 1 = ends with 2
2 power 2 = ends with 4
2 power 3 = ends with 8
2 power 4 = ends with 6
------------------------------
2 power 5 = ends with 2
then this cycle continues, so we can conclude that,
2 power 49 = ends with 2
2 power 50 = ends with 4
2 power 51 = ends with 8

Answer / kavyashri

8

Answer / abhijeet gupta

8
beacause 2 pow 1=2
2 pow 2 =4
2 pow 3 =8
2 pow 4 =16 end with 6
2 pow 5 =32 end with 2
-------------------------------------------------------------
so 2 pow 49 =end with 2
50 =end with 4
51=end with 8

Answer / vasanth raj

2 pow 1=2,
2 pow 2=4,
2 pow 3=8,
2 pow 4=16 (6);

2 pow 51==== so 51/4= remainder 3......so....3rd one
aplicable...2 pow 3=8;so answer 8.....

Answer / vijay chouhan

Here we take 2^51; according to formula(see Abhijit Guha quantitute aptitute) when power is divided by 4 and give reminder that is non zero, take reminder as power of last digit of given number;

2^51; 51%4=3;
so 2^3=8;
ANS=8

Answer / sandeep

8

Answer / pradip dharam

See Unit(2^5) = 2
51 / 5 = 10 and 1 rem

Unit(2^10) = 4

4*2=8

Answer / mahesh

2^51=?
unit digit values 2
2^1=2
2^2=4
2^3=8
2^4=6
.
.
.2^51=
51/4=rem(3)
2^3=8
so ans 8

Answer / vinay rajesh

2^51=2^25*2^26
2^25=2^5^5
2^26=2^5^5*2
2^5^5 ends with 2 as 2^5ends wirh 2 and when raised 5 times gives 2 so
2^5^5*2 gives 2*2
finally 2*2*2=8

Answer / debadatta patra

2^1=2
2^2=4
2^3=8
2^4=16
this sequence repeat again and again so we know that after
every four times again unit digit repeat as 2,4,8,16 so
correct answer is 2 here

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