निम्नलिखित में से कौन सा विकल्प दी गई श्रृंखला में प्रश्नवाचक चिह्न (?) को प्रतिस्थापित करेगा? 8, 16, ?, 38, 41, 82

What should come in place of '?' in the given number series? 111, 110, 106, 97, 81, ?

Which of the given letter-number clusters will replace the question mark (?) in the following series to make it logically complete? NVA 7, KSX 14, HPU 21, EMR 28, ?