CBSE Class 8 Answered
if x and y are the number of possibilities that A can assume such that the unit digit of A and A cube are same and the unit digit of A square and A cube are same respectively, then the value of x-y is (where A is a single digit number)
1) 4 2) 2
3) 3 4) 5
Asked by kakkar727 | 21 Oct, 2018, 01:18: PM
Expert Answer
Given :
A = A3
A3 - A = 0
A (A2 - 1) = 0
A = 0 or A - 1 = o or A + 1 + 0
Therefore x = A = {-1, 1, 0}
Next,
A2 = A3
A3 - A2= 0
A2(A - 1) = 0
A2= 0 or (A - 1) = 0
Therefore A = 0 or A = 1
y = A = {1, 0}
x - y = 3 - 2 = 1
Answered by Yasmeen Khan | 22 Oct, 2018, 06:11: PM
Application Videos
Concept Videos
CBSE 8 - Maths
Asked by rubisen988 | 24 Mar, 2024, 08:11: PM
ANSWERED BY EXPERT
CBSE 8 - Maths
Asked by khushimitra73 | 22 Mar, 2024, 06:46: PM
ANSWERED BY EXPERT
CBSE 8 - Maths
Asked by sunitalamborlambor | 18 Mar, 2024, 09:19: PM
ANSWERED BY EXPERT
CBSE 8 - Maths
Asked by vashisthanant11 | 17 Mar, 2024, 08:56: PM
ANSWERED BY EXPERT
CBSE 8 - Maths
Asked by yarnagulaanandi | 17 Mar, 2024, 01:07: PM
ANSWERED BY EXPERT
CBSE 8 - Maths
Asked by sujithashanmukhi93 | 15 Mar, 2024, 07:51: PM
ANSWERED BY EXPERT
CBSE 8 - Maths
Asked by deepakrajpoot2256 | 15 Mar, 2024, 12:36: PM
ANSWERED BY EXPERT
CBSE 8 - Maths
Asked by pushplatagaur83 | 13 Mar, 2024, 01:17: PM
ANSWERED BY EXPERT