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If r = 199,999 and s = 991,999, which of the following is the units

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If r = 199,999 and s = 991,999, which of the following is the units  [#permalink]

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New post 15 Apr 2016, 01:04
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A
B
C
D
E

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Re: If r = 199,999 and s = 991,999, which of the following is the units  [#permalink]

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New post 15 Apr 2016, 03:52
If r = 199,999 and s = 991,999, which of the following is the units digit of r^2 + s^3?

A. 0
B. 1
C. 3
D. 9
E. 7

IMO cyclicity of 9 =2
1+9 = 0 A is the answer
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Re: If r = 199,999 and s = 991,999, which of the following is the units  [#permalink]

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New post 15 Apr 2016, 11:31
Bunuel wrote:
If r = 199,999 and s = 991,999, which of the following is the units digit of r^2 + s^3?

A. 0
B. 1
C. 3
D. 9
E. 7


Using cyclicity rule of number 9

\(199,999^2\) will have units digit as 1

\(991,999^3\) will have units digit as 9

Thus \(r^2\) + \(s^3\) = 1 + 9 = 0

Thus answer will be (A) :-D :lol:
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Re: If r = 199,999 and s = 991,999, which of the following is the units   [#permalink] 15 Apr 2016, 11:31
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If r = 199,999 and s = 991,999, which of the following is the units

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