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units digit in expansion os 2 raised to 51 is:
2 4 6 8
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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
| Is This Answer Correct ? | 174 Yes | 11 No |
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
| Is This Answer Correct ? | 63 Yes | 3 No |
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.....
| Is This Answer Correct ? | 43 Yes | 3 No |
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
| Is This Answer Correct ? | 25 Yes | 2 No |
Answer / pradip dharam
See Unit(2^5) = 2
51 / 5 = 10 and 1 rem
Unit(2^10) = 4
4*2=8
| Is This Answer Correct ? | 17 Yes | 5 No |
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
| Is This Answer Correct ? | 6 Yes | 0 No |
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
| Is This Answer Correct ? | 0 Yes | 0 No |
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
| Is This Answer Correct ? | 8 Yes | 28 No |
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