if x y 10 and difference between cube of x and cube of y is D then D-1 is a

I think question was for two consecutive whole numbers..
taking x=12 and y=11
it follow all the condition and answer will be option d (all are given)...
11 years agoHelpfull: Yes(13) No(0)

Wrong question. The actual question was.

There are two consecutive whole no.'s X & Y. If X>Y>10 and the difference between the cube of x and y is D then D-1 is
a) divisible by X
b) divisible by Y
c) multiple of 3
d) all of the above.

Ans. (d) All of the above. Try it out with any two consecutive whole no.'s you'll get the answer. eg. 12 and 11 or 13 and 12 etc. It will satisfy all the options.
11 years agoHelpfull: Yes(8) No(2)
are mere bhai rohit ...it is given that x and y are consecutive....x>y.. it example {(21)^3}-{(20)^3}= 9261-8000=1261 so D is 1261...D-1=1260 and its devide by all three x ,y and factor of 3..i.e 1260/21=60,,1260/20=63,,1260=420*3..
11 years agoHelpfull: Yes(4) No(0)
options are not correct..last option is like both a,b,c means divisable by x,y,and multiple of 3 .And it is the correct answer
11 years agoHelpfull: Yes(2) No(0)
Rohit bhai question was for two consecutive whole numbers...
and option d will be correct (as u not given here)
11 years agoHelpfull: Yes(2) No(0)
but we do not get answer when x=20 and y=15 or x=20 and y=13 check on these values
11 years agoHelpfull: Yes(1) No(2)
c
x=12;y=13;D=12^3-11^3=397;
D-1/x..true
d-1/y..true
11 years agoHelpfull: Yes(0) No(3)
D------
x=15 x^3=3375
y=11 y^3=1331
D=2044
D-1=2043
ANS- C
11 years agoHelpfull: Yes(0) No(6)
d is the correct answer
11 years agoHelpfull: Yes(0) No(0)
but para it also satisfy the cndtion of option c also..
11 years agoHelpfull: Yes(0) No(1)

if x>y>10 and difference between cube of x and cube of y is D then D-1 is

a)divisible by x
b)divisible by y
c) both a and b
d)multiple of 3