दिए गए विकल्पों में से उस अक्षर-समूह का चयन करें जो दी गई श्रृंखला को पूरा करने के लिए प्रश्न चिह्न (?) को प्रतिस्थापित कर सकता है। NDTK, MFQO, ?, KJKW, JLHA

A girl counted in the following way on the fingers of her left hand: She started by calling the thumb 1, the index finger 2, middle finger 3, ring finger 4, little finger 5 and then reversed direction calling the ring finger 6, middle finger 7, and so on. If she counted up to 1994, on which finger did she end her counting?

For an infinite geometric progression a, ar, ar2, ar3, ... if the numerical value of common ratio |r| < 1, then the sum to infinity S∞ will be: