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Which of the following could be the units digit
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Updated on: 14 Sep 2024, 01:06

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Question Stats:

\(A=4^x\) and \(B=9^y\)

Which of the following could be the unit’s digit in\( A \times B\), if x and y are non-negative integers?

A. 0

B. 1

C. 2

D. 3

E. 4

F. 5

G. 6

H. 7

I. 8

J. 9

Which of the following could be the unit’s digit in\( A \times B\), if x and y are non-negative integers?

A. 0

B. 1

C. 2

D. 3

E. 4

F. 5

G. 6

H. 7

I. 8

J. 9

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Re: Which of the following could be the units digit
[#permalink]
13 Sep 2024, 23:34

1

Isnt the units digit 4 or 6?

4^x can have only 4 or 6

9^x can have 9 or 1 in units place

4*9, 6*1 = 6

4*1, 9*6= 4

possible outcomes for AXB are 4 or 6

4^x can have only 4 or 6

9^x can have 9 or 1 in units place

4*9, 6*1 = 6

4*1, 9*6= 4

possible outcomes for AXB are 4 or 6

Which of the following could be the units digit
[#permalink]
14 Sep 2024, 01:05

Expert Reply

Sorry but the question is some how misleading because according to the stem is \(A \times B\) but in the solution they give me (check right now) A + B

We go for the stem.

Thank you so much sir

We go for the stem.

Thank you so much sir

gmatclubot

Which of the following could be the units digit [#permalink]

14 Sep 2024, 01:05
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