ज्यामितीय प्रगति में पाँच संख्याएँ इस प्रकार हैं कि उनका गुणनफल 32 है। तीसरी संख्या ज्ञात कीजिए।

  1. 4
  2. 1/2
  3. 2
  4. 8

Answer (Detailed Solution Below)

Option 3 : 2
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दिया गया है​:

ज्यामितीय प्रगति में 5 संख्याओं का गुणनफल = 32

गणना:

मान लें कि ज्यामितीय प्रगति में पाँच संख्याएँ ar2, ar, a, a/r, a/r हैं 

⇒ ar2  × ar ×  a ×  a/r ×  a/r2 = 32

⇒ a5 = 32

⇒ a5 = 25 

घातें समान हैं इसलिए आधारों को बराबर करने पर,

a = 2 

ज्यामितीय प्रगति की तीसरी संख्या a है

∴ तीसरा संख्या 2 है।

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