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GMAT Quantitative Reasoning Practice Test 4
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© examsnet.com
Question : 13
Total: 100
What is the units' digit of
9
7
×
17
3
×
3
3
?
3
5
7
8
9
Validate
Solution:
17
3
×
3
3
=
(
17
×
3
)
3
=
51
3
=
51
×
51
×
51
→
the units' digit is just
1
×
1
×
1
=
1
.
We are left with the units' digit of 97 .
9
7
=
9
×
81
×
81
×
81
→
the units' digit is 9 .
© examsnet.com
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