संख्या 84328556 में, बाएं से सम स्थानों वाले अंकों में से 2 घटाएं और विषम स्थानों वाले अंकों में 1 जोड़ें। परिणामस्वरूप प्राप्त संख्या में कितने अंक अभाज्य संख्याएं हैं?

If 2 is added to each odd digit and 1 is subtracted from each even digit in the number 7815642, which of the following digits will be third from the left?

If 3 is added to each odd digit and 2 is subtracted from each even digit in the number 5341256, what will be the sum of the digits which are first from the left and second from the right in the new number thus formed?