Some examples of the function defined:GHong14 wrote:[y] denotes the greatest intenger less than or equal to y. is d<1?
1) d = y-[y]
2 [d]= 0
[4.3] = 4
[4] = 4
[5] = 5
So, you can see for any number 4<=x<5, [x] = 4
Is d <1 ?
Statement 1:
d = y-[y]
If y =5, d = 0 < 1
If y = 4.3 , d = 4.3 -4 = 0.3 <1
You can try for any number, and will get the same result.
Sufficient
Statement 2:
[d] = 0
=> 0<= d <1
Sufficient
Hence, D
