Fiitjee PT3

@Arshad I was getting ans as 56

Plz post the soln

Thanks xyz :)

ur welcome...!!!
[299]

oops I made a mistake

gOT IT now Thanks:)

see the smallest three digit number having x<y<z is 123
so 123 onwards
from 123 to 200 there are
7+6+5+4+3+2+1=28 digits having x<y<z
from 200 to 300
6+5+4+3+2+1=21
ans so on
5+4+3+2+1=15 and
4+3+2+1=10
and
3+2+1=6
2+1=3
+1
add all these and u get 84

@madhu Thanks:)

Easy one but doubt in ANS given

No of 3 digit no.s xyz such that (x<y<z)

(A) 84

(B) 56

three S-O double bonds.............tried to make appropriate diagram..............bt srry.............

O O
II II
HO-S-S-OH
II
O
the structure.....................

tnx

I think i will hav to start doing inorganic [2]

It has an S-S bond

I got the structure of h2s205

http://targetiit.com/iit-jee-forum/posts/chemical-structure-4821.html

ans 1 i dont remember exactly , but i have seen this some where .......

it has S-0-S bond , not S-S bond , but dont trust my ans i m not dat sure

Sorry for 2 nd question It had to be posted in Maths section