Maths
Maths Puzzle
Numerical Ability
Algebra
(1^3+2^3+3^3+.........+10^3)^10
Find Its Unit Digit
a) 2
b) 8
c) 5
d) 0
Read Solution (Total 1)
-
- c) 5
Unit digits of 1^3, 2^3, 3^3, .........,10^3 are 1, 8, 7, 4, 5, 6, 3, 2, 9, 0 respectively.
Adding them we get 5 at unit place.
Now 5^n results into 5 at unit place.
Hence number xxx5^10 will have 5 at its unit place. - 6 years agoHelpfull: Yes(1) No(0)
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