Elitmus Exam Numerical Ability Number System

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

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Elitmus Other Question

In a Chimp Zoo there are 1 billion monkeys. The probability that a monkey in the zoo has seen a Banyan tree is 0.6. The probabilty that a monkey has seen a mango tree is 0.65. What is the minimum percentage of monkeys in the zoo who have seen both the trees?
a 25%
b 39%
c 40%
d 60%
How many numbers can be fromed from the digits 0,2,4,6,8 which are divisible by 8