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Admissions Success Stories What is the 99th digit after the decimal point in the

This topic has 1 expert reply and 1 member reply

What is the 99th digit after the decimal point in the

Post Tue Aug 07, 2018 7:49 pm

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What is the 99th digit after the decimal point in the decimal expansion of 2/9 + 3/11?

A. 1
B. 2
C. 4
D. 7
E. 9

OA C

Source: Manhattan GMAT

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Post Tue Aug 07, 2018 9:12 pm
BTGmoderatorDC wrote:
What is the 99th digit after the decimal point in the decimal expansion of 2/9 + 3/11?

A. 1
B. 2
C. 4
D. 7
E. 9

OA C

Source: Manhattan GMAT
2/9 = 0.2222...; we see that the 99th digit would be '2.'
3/11 = 0.2727...; we see that the digits at odd places are 2,' while that at even places are '7.' Since 99 is odd, the 99th digit would be '7.'

Thus, the 99th digit after the decimal point in the decimal expansion of 2/9 + 3/11 = 2 + 2 = 4.

The correct answer: C

Hope this helps!

-Jay
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Post Wed Aug 08, 2018 10:17 am
$$\frac{2}{9}=0.2222222...............2$$
$$\frac{3}{11}=0.27272727...............27$$
Addition (does not have carries)
$$\frac{2}{9}+\frac{3}{11}=0.49494949..........49$$
Odd's have 4.

99th would have 4. Therefore, C is the correct answer. Regards!

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