[GMAT math practice question]
What is 1/2 + 1/6 + 1/12 + 1/20 + 1/30 + 1/42 + 1/56?
A. 3/5
B. 5/8
C. 7/8
D. 8/9
E. 9/10
What is 1/2 + 1/6 + 1/12 + 1/20 + 1/30 + 1/42 + 1/56?
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- Max@Math Revolution
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A
B
C
D
E
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1/2 + 1/6 + 1/12 + 1/20 + 1/30 + 1/42 + 1/56Max@Math Revolution wrote:[GMAT math practice question]
What is 1/2 + 1/6 + 1/12 + 1/20 + 1/30 + 1/42 + 1/56?
A. 3/5
B. 5/8
C. 7/8
D. 8/9
E. 9/10
= 1/2 + (1/2 - 1/3) + (1/3 - 1/4) + (1/4 - 1/5) + (1/5 - 1/6) + (1/6 - 1/7) + (1/7 - 1/8)
= 1/2 + 1/2 - 1/8
= 1 - 1/8
= 7/8
The correct answer is C.
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Followed here and elsewhere by over 1900 test-takers.
I have worked with students based in the US, Australia, Taiwan, China, Tajikistan, Kuwait, Saudi Arabia -- a long list of countries.
My students have been admitted to HBS, CBS, Tuck, Yale, Stern, Fuqua -- a long list of top programs.
As a tutor, I don't simply teach you how I would approach problems.
I unlock the best way for YOU to solve problems.
For more information, please email me (Mitch Hunt) at [email protected].
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- Max@Math Revolution
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=>
1/2 + 1/6 + 1/12 + 1/20 + 1/30 + 1/42 + 1/56
= 1/(1*2) + 1/(2*3) + 1/(3*4) + 1/(4*5) + 1/(5*6) + 1/(6*7) + 1/(7*8)
= (1/1 - 1/2) + (1/2 - 1/3) + (1/3 - 1/4) + (1/4 - 1/5) + (1/5 - 1/6) + (1/6 - 1/7) + (1/7 - 1/8)
= 1/1 - 1/8 = 7/8
Therefore, C is the answer.
Answer: C
1/2 + 1/6 + 1/12 + 1/20 + 1/30 + 1/42 + 1/56
= 1/(1*2) + 1/(2*3) + 1/(3*4) + 1/(4*5) + 1/(5*6) + 1/(6*7) + 1/(7*8)
= (1/1 - 1/2) + (1/2 - 1/3) + (1/3 - 1/4) + (1/4 - 1/5) + (1/5 - 1/6) + (1/6 - 1/7) + (1/7 - 1/8)
= 1/1 - 1/8 = 7/8
Therefore, C is the answer.
Answer: C
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