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MBA Entrance Exams / #CMAT

May 18, 2017 @ 02:49 PM

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May 18, 2017 @ 02:49 PM

Simsr
K. J. Somaiya Institute of Management Studies and Research, Mumbai

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Important Quant Question Progressions AP

MBA aspirants, who are appearing in forthcoming CMAT second test from 21st February 2013 to 25th February 2013, may find following useful in Quant section: 

Progressions: Finding Common Difference of an AP
 
Question 
 
Sum of first 25 terms of an AP is 525; sum of the next 25 terms is 725; what is the common difference?
 
1.8/25
2.4/25
3.6/25
4.1/5
 
 
Answer
 
Correct Choice is (1) and Correct Answer is 8/25
 
 
Explanatory Answer
 
The sum of the first 25 terms, S25 = 525
The sum of the next 25 terms, K25 = sum of next 25 terms = 725
a26 = a1 + 25d
a27 = a2 + 25d
K25 = a26 + a27 + ...... + a50
Or K25 = a1 + 25d + a2 + 25d + ...... + a25+ 25d
Or K25 = a1 + a2 + ...... + a25+ 25(25d)
Or K25 = S25 + 25(25d)
i.e., 725 = 525 + 25 x 25d
200 = 25 x 25d 
8 = 25d
d = 8/25
 

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