IMO A This question can be solved in 2 parts. part 1) when the unit digit is 0 (rememeber, any number ending with 0 is an even number) 9*8*7*1 = 504 ( 1 option for unit digit*9 digits for thousand digit, 8 for hundered and 7 for tens) part 2) when the unit digit is any number from 2,4,6,8 8*8*7*4 = ...

IMO A...

The mention is only to bring to the notice that despite a good start of medicine in ancient China, the current situation has not progressed to an extent it should had...Hence, the author is describing the need of a modernised approach to China's medicine..

I believe the optios boils down to A and C. Both the statements are supported by the passage. For Option A, we have : But it took two and a half centuries of scientific advancement to accumulate the facts to prove his hypothesis. and for Option C, we have : . This knowledge has revolutionized our me...

I has to be 'was'...
2 reasons..look at the word before portion...A portion...when it is A portion, it has to be 'was' and not were..and in general, portion is treated as singular..

3. in how many ways a three digit number can be written using all of the digits from 1 to 9 without repetition of any digit? 9*8*7 thats what i thought at first. but its actually 9^3 ways. at least thats what is on the answer key. does somebody know? It cant be 9^3.. The first digit can be filled b...

IMO D There are 2 ways in which the boat can take 10 people accorss the river 1. first trip - 4 ppl, second trip - 4 ppl 2. first trip - 6 ppl, second trip - 6 ppl 3. first trip - 5 ppl, second trip - 5 ppl 4. first trip - 5 ppl, second trip - 5 ppl for first 2, we have 10C6 and 10C4 = 420 for next ...

Cans, i m not sure if i understand your solution. It would be helpful if you can please elaborate on your explanation? if median=3, we have to select 1,2,3. then selecting any 2 numbers other than 4,5 will result in mean > median. thus 7C2 - 1 = 20 if median=8, mean max=8. thus 0 way. if median=7, m...