Official Quant thread for CAT 2013

MBA CAT 2024
7481
@Cat.Aspirant123 said:
If S = 3 + 5 + 9 + 17 + 33 + €Ś the value of the 10th term of the series is _____.
S= 3+ 5 +9 +17+-----------+(n-1)terms-+Tn
Tn=3 + 2+ 4+ 8+ 16 +--------------+(n-1)terms
Tn=3+2(2^n-2-1)
Tn=1+2^n-1
T10=1+2^9
=513
7482
@gnehagarg said:
S= 3+ 5 +9 +17+-----------+(n-1)terms-+Tn Tn=3 + 2+ 4+ 8+ 16 +--------------+(n-1)terms Tn=3+2(2^n-2-1) Tn=1+2^n-1 T10=1+2^9 =513
nth term of the series is 2^n+1=2^10+1=1025(10th term)
7483

Here is another easy one : When a certain natural number is multiplied by 7 , the product obtained consists only of fives. Find the least value of such a natural number !!

7484
@kingsleyx 79365 but i used calci for that 😛 its quite simple u can take out directly keep on dividing
55/7
555/7
5555/7
55555/7
555555 u get answere
eureka !!!!!

7485
@kingsleyx said:
Here is another easy one : When a certain natural number is multiplied by 7 , the product obtained consists only of fives. Find the least value of such a natural number !!
79365
7486
@kingsleyx 79365 is the answere i wrote it whats the answere then?
7487
@sauravd2001 said:
@kingsleyx 79365 is the answere i wrote it whats the answere then?
My bad !! sorry !!
7488
@kingsleyx bhai chopsey kardi tune 😛 calci pe shak karne laga tha :P
7489

Not proper QA question but just for fun!!


5+3=28
9+1=810
8+6=214
5+4=19

then 7+3= ????

7490
@pratyush9811 410
7491
@pratyush9811 said:
Not proper QA question but just for fun!!5+3=289+1=8108+6=2145+4=19 then 7+3= ????
410??
7492
@pratyush9811 said:
Not proper QA question but just for fun!!5+3=289+1=8108+6=2145+4=19 then 7+3= ????
410??
7493
@pratyush9811 said:
Not proper QA question but just for fun!!5+3=289+1=8108+6=2145+4=19 then 7+3= ????
410?
7494
@Cat.Aspirant123 said:
Bacteria reproduce in such a manner that every hour their number doubles. In a controlledexperiment that started with one bacterium in a jar at 2 pm on Saturday, the jar was found to becompletely full at 12 noon on Wednesday. Had there been 64 bacteria initially, when would the jar becompletely full?
2^70*64
7495
@gnehagarg what i feel is that it should fill up 6 hours before because
if initially there where 1 then after every hour
1,2,4,8,16,32,64
ab initially 64 de rakha hai toh iske ag etoh series same rahegi aur kahta hai ki fill up in 94 hours with 1 bacteria toh with 64 in there it should be filled up in 88hrs
7496
AT what time between 7&8 are the hands of a watch equidistant from NO. 8 at the clock??
7497
@pratyush9811 said:
AT what time between 7&8 are the hands of a watch equidistant from NO. 8 at the clock??
7:420/11 ?
7498
@maddy2807
7499
@pratyush9811 what this no.8 =number 8?
7500
@sauravd2001 yes between 7 to 8 at what time will both the hands will b equidistant from number 8..