यदि संख्या 1735683 के प्रत्येक विषम अंक में 1 जोड़ा जाए तथा प्रत्येक सम अंक में से 2 घटाया जाए, तो इस प्रकार बनी नई संख्या में कितने अंक एक से अधिक बार आएंगे?

Find the odd letter group from the given options:

How many such pairs of letters are there in the word 'SECURITY' each of which has as many letters between them in the word as in the English alphabetical series when counted from both forward and backward directions?