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# What is the Units digit of 13^4 * 17^2 * 29^3 A. 9 B. 7

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What is the Units digit of 13^4 * 17^2 * 29^3 A. 9 B. 7 [#permalink]

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12 Nov 2005, 19:16
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What is the Units digit of 13^4 * 17^2 * 29^3

A. 9
B. 7
C. 5
D. 3
E. 1

I know there has to be a fast trick to this - just not sure what it is.
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Joined: 29 Oct 2005
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12 Nov 2005, 19:23
I got E....

Just multiply the unit digits

13^4 ---> 3 * 3 * 3 * 3 = 8"1"

17^2 ----> 7 * 7 = 4"9"

29^3 ----> 9*9*9 = 72"9"

1 * 9 * 9 = 8"1"

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12 Nov 2005, 20:01
Yup, E it is. The shortcut is what agave showed.
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