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AurobindoSaha
- Junior | Next Rank: 30 Posts
- Posts: 17
- Joined: Mon May 24, 2010 4:08 am
- Location: Kolkata, India
- Thanked: 2 times
- Followed by:1 members
Hello,
As for Day 1's assignment, I did not quite understand the following explanation on PS & DS in Diagnostic Test section of OG12.
Will appreciate if any one of you can help me to understand these.
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Q 14. very complicated explanation, can someone please re explain
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Q 15. The way power of 10 is calculated is first by knowing (multiplying the prime numbers < 20). In real test is it intended that we need to do so big multiplications 2x3x5x7x13x17x19. Is there any better way of solving this problem?
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Q 25. The method explained by squaring each sample number looks very crude. Its involves lots of maths. A better way I find is as follows -
We are considering 2,3,4,5,6,7,8,9 here as unit digit of n
just concentrate in squaring or cubing only the unit digit of n (i.e. the numbers mentioned above).
According to my understanding no need to test by squaring the complete number n
Statement 1: Satisfied for 5,6 - Insufficient
Statement 2: Satisfied for 4,5,6,9 - Insufficient
we can not arrive at a conclusion what will be the unit digit of n.
Hence E
Please let me know if my approach is correct.
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Q 26. I chose C, Basically the question is asking p as LCM of 2,3,5,7 i.e. 210
The answer is actually E, just because I assumed the word "only" as implied.
Feeling tricked
Anyway, I accept E as correct answer.
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Q 31. I am seeing the solution has been done by trial and error method using different values. This can be very laborious in actual test. Is there a better method available.
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Q 34. Did not understand the explanation
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Thanks in advance
As for Day 1's assignment, I did not quite understand the following explanation on PS & DS in Diagnostic Test section of OG12.
Will appreciate if any one of you can help me to understand these.
-------------------------------------------------------------------------------------
Q 14. very complicated explanation, can someone please re explain
-------------------------------------------------------------------------------------
Q 15. The way power of 10 is calculated is first by knowing (multiplying the prime numbers < 20). In real test is it intended that we need to do so big multiplications 2x3x5x7x13x17x19. Is there any better way of solving this problem?
-------------------------------------------------------------------------------------
Q 25. The method explained by squaring each sample number looks very crude. Its involves lots of maths. A better way I find is as follows -
We are considering 2,3,4,5,6,7,8,9 here as unit digit of n
just concentrate in squaring or cubing only the unit digit of n (i.e. the numbers mentioned above).
According to my understanding no need to test by squaring the complete number n
Statement 1: Satisfied for 5,6 - Insufficient
Statement 2: Satisfied for 4,5,6,9 - Insufficient
we can not arrive at a conclusion what will be the unit digit of n.
Hence E
Please let me know if my approach is correct.
-------------------------------------------------------------------------------------
Q 26. I chose C, Basically the question is asking p as LCM of 2,3,5,7 i.e. 210
The answer is actually E, just because I assumed the word "only" as implied.
Feeling tricked
Anyway, I accept E as correct answer.
-------------------------------------------------------------------------------------
Q 31. I am seeing the solution has been done by trial and error method using different values. This can be very laborious in actual test. Is there a better method available.
-------------------------------------------------------------------------------------
Q 34. Did not understand the explanation
-------------------------------------------------------------------------------------
Thanks in advance
Thanks
Aurobindo
Aurobindo
