In a certain code, '256' means 'red colour chalk' ; '589' means 'green colour flower' and '245' means 'white colour chalk'. Which digit in that code means 'white' ?
Series : 5 1 4 7 3 9 8 5 7 2 6 3 1 5 8 6 3 8 5 2 2 4 3 4 9 6 How many even numbers are there in the sequence which are immediately preceded by an odd number but immediately followed by an even number ?