यदि समांतर श्रेणी \(7,,\Box,,21,28,\ldots\) है, तो रिक्त स्थान में कौन-सा पद होगा?
If \(7,,\Box,,21,28,\ldots\) is an arithmetic progression, what term fills the blank?
Explanation opens after your attempt
C. (14)
Concept
The difference between (21) and (28) is (7), so the missing term is (21-7=14). In exams, apply the difference backward too.
Why this answer is correct
The correct answer is C. (14). The difference between (21) and (28) is (7), so the missing term is (21-7=14). In exams, apply the difference backward too.
Exam Tip
(21) और (28) का अंतर (7) है, इसलिए रिक्त पद (21-7=14) है। परीक्षा में पीछे की ओर भी अंतर लगाएँ।
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