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Numerical Ability
Number System
unit digit of 4^5^6^7^8^9
Read Solution (Total 20)
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- 4.. since 5^anything wil result in no having unit digit 5(which is odd)..so as per encyclicity of 4.. unit digit will be 4.
- 11 years agoHelpfull: Yes(30) No(16)
- it should be 6...
unit place of 4^5 is 4 n then 4^6 is 6 n then 6^smthng is 6
pls correct me if m wrong - 11 years agoHelpfull: Yes(28) No(19)
- but here 4^(5*6*7*8*9)= 4^(15120) so 15120 is even ....so 4^(even)=6 at unit
am i ryt... - 11 years agoHelpfull: Yes(24) No(5)
- Answer will be 4 bcoz4. 5^anything wil result in no having unit digit 5(which is odd)..so as per cyclicity of 4.. unit digit will be 4
- 11 years agoHelpfull: Yes(13) No(6)
- write 4=2^2
now2*5*6*7*8*9=3024
2^1=unit digit is 2
2^2=.....4
2^3=...8
2^4=...6
2^5=...2
2^6=..4
nw cycle is here n=4
3024%4=0
so unit's digit is last no. of cycle
that is 6
- 11 years agoHelpfull: Yes(9) No(0)
- 4^5=1024
1024^6^7^8^9
6*7*8*9=3024
we could take last two digit of 1024..i.e24
(24)^3024
last digit will be 6
as 24^even=ends in76 - 11 years agoHelpfull: Yes(4) No(6)
- @Anamika it should b considered frm base of not?
how can we assume 5^smthng wen it itself is a power? - 11 years agoHelpfull: Yes(2) No(1)
- 5 to d pwer anything gives 5 as last digit...4 to d pwer 5 gives last digit as 4
- 11 years agoHelpfull: Yes(1) No(4)
- ans:4
as 9 can be witten as 4*2 +1
so 4^1=4 - 11 years agoHelpfull: Yes(1) No(3)
- ans:4 ; 4^5=4
- 11 years agoHelpfull: Yes(1) No(4)
- SINCE 5 TO THE POWER ANYTHING WILL BE 5,
SO, 4^5 = 1024,
4 will be the LAST DIGIT !!!
- 11 years agoHelpfull: Yes(1) No(3)
- 6 is the unit's digit!
- 11 years agoHelpfull: Yes(1) No(0)
- correcr answer please
- 11 years agoHelpfull: Yes(0) No(0)
- Correct answere is 4
- 11 years agoHelpfull: Yes(0) No(0)
- result of 5^x
in units place is always 5
so 4^x
x is somedigit having 5 in its units place..
for 4 ^ something in odd we get 6 in units place...
so ans is 6 - 11 years agoHelpfull: Yes(0) No(1)
- anything 5 power will give unit digit as 5
so 4^5
4^1=4
4^2=16
4^3=-4
4^4=--6
4^5=---4
so 4 is unit digit - 10 years agoHelpfull: Yes(0) No(0)
- correct ans=6..100%
- 10 years agoHelpfull: Yes(0) No(0)
- 4^5=1024.
6*7*8*9=3024
we could take last two digit of 1024..i.e24
(24)^3024
last digit will be 6 - 9 years agoHelpfull: Yes(0) No(0)
- any power of 4 gives only 2 outcomes in unit's digit i.e, 4 and 6. for odd multiple of power unit is 4 where as for even multiple unit is 6. here total power is(5*6*7*8*9)=15120 exactly divisible by 4
ANS=6 - 9 years agoHelpfull: Yes(0) No(0)
- Answer will be 4 becoz 5 raised to any power gives last digit 5 and 4 to the odd power gives 4. Moreover for those who r getting ans 6, I'll gv an example, 2^2^3 is 2^8 and not 2^6 ie we dont multiply power for such cases, while (((2)^2)^3) will give 2^6. Also the calculation is from top to down and nt otherwise.
- 8 years agoHelpfull: Yes(0) No(0)
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