Correct option is A
2 6 7 4 9 3 6 5 1 9 5 2 4 5 9 4 2 3 7 1
How many even numbers are immediately preceded by an odd number and immediately followed by a prime number?
we need to find = odd number, even number, prime numbers
2 6 7 4 9 3 6 5 1 9 5 2 4 5 9 4 2 3 7 1
only two such even numbers 6 and 4 are there.