यदि a, b, c समांतर श्रेढ़ी में है तब 3a, 3b, 3c ________ में है।

  1. समांतर श्रेढ़ी
  2. गुणोत्तर श्रेढ़ी
  3. हरात्मक श्रेढ़ी
  4. इनमें से कोई नहीं

Answer (Detailed Solution Below)

Option 2 : गुणोत्तर श्रेढ़ी
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Detailed Solution

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a, b, c समांतर श्रेढ़ी में हैं

⇒ b - a = c - b ⇒ 2b = a + c---(1)

यदि a, b, c गुणोत्तर श्रेढ़ी   में हैं तो \(b = \sqrt{a\times c}\)

\({3^b} = \sqrt {{3^a} \times {3^c}} \)

दोनों पक्षों का वर्ग करने पर हमें प्राप्त होता है

\({3^{2b}} = {3^{a + c}}\) ⇒ 2b = a + c -----(2)

(1) और (2) से हमें प्राप्त होता है

अनुक्रम \({3^a},\;{3^b},\;{3^c}\) एक गुणोत्तर श्रेढ़ी  है।

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