bs0409's posts
bs0409 replied to ShoutBox.
@karl MDI mila ???
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bs0409 replied to Official Quant thread for CAT 2013
OA-180/7
bs0409 replied to Official Quant thread for CAT 2013
OA-0
Mr. X leaves his house daily at a particular time to go to his office. He reaches office 10 minutes late when he travels at 20 kmph and 5 minutes early when he travels at 30kmph. At what speed should he travel to reach office on time.
bs0409 replied to Official Quant thread for CAT 2013
1/5^903=2^903/10^903
now last two digits of 2^903 are 08
so ans=08
How many common roots do 2 equation have
x^3-7x^2+6x+1=0 & x^3-6x^2+x+7=0
1.0
2.3
3.2
4.4
5.none
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bs0409 replied to Official Quant thread for CAT 2013
My take-0..........
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bs0409 replied to Official Quant thread for CAT 2013
Shouldn't the condition be 144-4ac>=0
bs0409 replied to Official Quant thread for CAT 2013
if a and c are integer and 3<=a<=7 and 0<=c then
how many equation of the form ax^2+12x+c=0 have real roots?
1.36
2.39
3.44
4.48
bs0409 replied to Official Quant thread for CAT 2013
Let the numbers be 7^a,7^b,7^c so, 7^(a+b+c)=7^13 a+b+c=13 So,15C2=105 solns But we want unordered solutions When two of a,b,c are same:2a+c=13 [since b=a] which has 7 solutions. So 3C2*7=21 cases for 2 of them to be same All three same i.e. a=b=c: not possible So Unordered pairs= (1...
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bs0409 replied to Official Quant thread for CAT 2013
OA-49/27 in how many ways 7^13 can be written as product of three natural nos
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bs0409 replied to Official Quant thread for CAT 2013
OA-5............ The infinite sum
1 + 4/7 + 9/7^2 + 16/7^3 + 25/7^4 +.....
equals
a.27/14
b.21/13
c.49/27
d.256/147