Elitmus Exam Numerical Ability Number System

How many numbers can be fromed from the digits 0,2,4,6,8 which are divisible by 8

Read Solution (Total 9)

Elitmus Other Question

let a0=1 and for positive integer n, define an=2an-1 if n is odd; and an=an-1 if n is even, Then what is the value of a100-a97-a96 equals

a0=a not plz understand clearly i can't type correctly in the puzzle box
A cow was standing on a bridge, 5 m away from middle of the bridge. A train was coming towards the bridge from the end nearest to the cow. seeing this the cow ran towards the train and managed to escape when the train was 2 m away from the bridge. If it had run in the opposite direction it would have been hit by the train 2m before the end of the bridge. What is the length of bridge in meters assuming speed of train is 4 times that of the cow.