Latest NDA Aptitude Question SOLUTION: Which one among the following is the hardest part of our body?
option
(A) Skull bones of head
(B) Thumb nails
(C) Enamel of teeth
(D) Spinal vertebra
There is something I don't understand about algebra: It has been around for thousands of years, yet no one has ever found out what the value of "x" or "y" really is.