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08 Jun 2017, 00:54
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What is the units digit of a positive integer n?
1) The units digit of \(n^2\) is 4
2) The units digit of \(n^3\) is 8
1) The units digit of \(n^2\) is 4
2) The units digit of \(n^3\) is 8
08 Jun 2017, 00:58
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MathRevolution
What is the units digit of a positive integer n?
1) The units digit of \(n^2\) is 4
2) The units digit of \(n^3\) is 8
1) The units digit of \(n^2\) is 4
2) The units digit of \(n^3\) is 8
Just curious to know, why statement A is Insufficient to answer.
As per statement A, n could be either +2 or -2 and as per question n is a positive integer. Thus combining statement A and question, n =2.
Kindly explain if I am making any mistake.
0akshay0
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Schools: Jindal '20 Kelley '20 Broad '20 Carey '20 Mays '20
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08 Jun 2017, 03:28
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elegantm
MathRevolution
What is the units digit of a positive integer n?
1) The units digit of \(n^2\) is 4
2) The units digit of \(n^3\) is 8
1) The units digit of \(n^2\) is 4
2) The units digit of \(n^3\) is 8
Just curious to know, why statement A is Insufficient to answer.
As per statement A, n could be either +2 or -2 and as per question n is a positive integer. Thus combining statement A and question, n =2.
Kindly explain if I am making any mistake.
for St I n can be 8 where the units digit of \(n^2 = 8^2\) is 4
since n can be 2 or 8 St I is insufficient
