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Exponent Problem... plz solve

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Junior | Next Rank: 30 Posts
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Exponent Problem... plz solve

by myornob » Sat Aug 25, 2007 7:11 am
Q. Which of the following is closest to (10^180)-(10^30)?

Ans-

A. 10^210
B. 10^180
C. 10^150
D. 10^90
E. 10^6

The answer is D (but I cant find the solution process)

Plz solve the problem
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by beny » Sat Aug 25, 2007 7:54 am
1. I doubt the answer is D.
2. What is the source to this problem?
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Junior | Next Rank: 30 Posts
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by myornob » Sat Aug 25, 2007 8:00 am
1) Ya, beny I've a doubt also to the answer D
2) btw, I got it from a set of PS question which is given by our GMAT instructor. donno frm where he got it.
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by beny » Sat Aug 25, 2007 8:55 am
The closest to a correct answer would be B.
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by devesh » Sat Aug 25, 2007 9:59 am
i vote for B too.
pls chk que again.
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by myornob » Sat Aug 25, 2007 11:47 am
Yes, I also think the ans. is B.

10^30(10^150-1) = 10^180 (closest one)

Thanks for ur comments.
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by myornob » Sat Aug 25, 2007 11:49 am
Yes, I also think the ans. is B.

10^30(10^150-1) = 10^180 (closest one)

Thanks for ur comments.
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