नीचे दी गई श्रृंखला में, क्रमिक संख्याओं के ऐसे कितने जोड़े हैं जिनमें से प्रत्येक का अंतर ठीक 2 है? 5 6 1 2 4 3 3 5 4 7 1 3 5 6 8 7 6 2 4 8 9

How many 3s are there in the given sequence that are preceded by an odd number and NOT succeeded by an even number? 1438738553179203553938

How many such prime numbers are there in the given series which are immediately preceded by an even number and immediately followed by an odd number? 2 3 1 7 5 9 2 5 4 8 6 7 9 1 6 3 5 4