Discussion Room : Quant

sir i got RS =6sqrt 3
dont know how to proceed further.......................................

@vinaycat2017
RS=6Sqrt3
Angle R =90
PR =12 (by similarity)
Apply pythagores in tri PRS
PS=sqrt(144+108)=6sqrt7Hope it helps..

3 individuals john wright, greg chappell and gary kristen are in the race for the appointment of new
coach of team india. The probabilities of their appointment are 0.5, 0.3 and 0.2 respectively. If john
wright is appointed then probability of ganguly appointed as a captain will be 0.7 and corresponding
probability if greg chappell or gary kristen is appointed are 0.6 and 0.5 respectively. find the overall
probability that ganguly will appointed as a captain

@rahuljodavula
In general,
If you have OR, ADD the probabilities.
If you have AND, multiply the probabilities.Here, Ganguly can be the captain in the following manner
(John AND Ganguly) OR (Greg AND Ganguly) OR (Gary AND Ganguly)
(0.5 * 0.7) + (0.3 * 0.6) + (0.2 * 0.5) = 0.63 should be our answer.
What's the OA ?

@zabeer zabeer sir ek profit loss ka doubt hai i cant calculate the initial and final amount plz help..
A reduction of 20% in the price of sugar enables a housewife to purchase 6 kg more for Rs. 240. What is the original price per kg of sugar?

@vinaycat2017
Let original price be x per kg
So initially, we could buy 240/x kg for 240 rupees
Now the new price is 0.8 x (20% reduction in x)
So now we can buy 240/0.8x kg for 240 rupees
The difference, 240/0.8x  240/x = 6 kg (given)
240/x (1.25  1) = 6
x = 240 * 0.25/6 = 40 * 0.25 = 10 rs / kg would be the original price.

@zabeer
accrding to me question is wrong

@vinaycat2017
I don't see a way to get a rational final result. So I also feel the options given are not right.

@zabeer
exactly

Find number of whole number solutions of a + b + c + d = 20 where a, b, c and d ≤ 8
= 23c3  4 * 14c3 + 4c2 * 5c3
= 1771  1456 + 60
= 375why 60 is as added here, if we go by the common way for odthis instead of coefficient method:
(9+a')+(b+c+d) =20
a'+b+c+d=11so total ways= 23C3 4*14c3.=315
which 60 cases need to be added here?
Could anyone expalin the part?