Latest Elitmus Aptitude Question SOLUTION: 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

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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

Asked In Elitmus rohit kumar (11 years ago)

Unsolved Read Solution (10)

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prayas goel  (11 years ago)

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)...

Is this solution Helpfull? Yes (13) | No   

Sandeep Kumar  (11 years ago)

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.

Is this solution Helpfull? Yes (8) | No (2)  

ankit chauhan  (11 years ago)

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..

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banashri borah  (11 years ago)

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

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prayas goel  (11 years ago)

Rohit bhai question was for two consecutive whole numbers...
and option d will be correct (as u not given here)

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rohit kumar  (11 years ago)

but we do not get answer when x=20 and y=15 or x=20 and y=13 check on these values

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Swapnasish Dutta  (11 years ago)

c
x=12;y=13;D=12^3-11^3=397;
D-1/x..true
d-1/y..true

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Nitin gupta  (11 years ago)

D------
x=15 x^3=3375
y=11 y^3=1331
D=2044
D-1=2043
ANS- C

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naga sarath chand  (11 years ago)

d is the correct answer

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ravi gangwar  (11 years ago)

but para it also satisfy the cndtion of option c also..

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