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The 10th term of the G.P. 5, 25, 125, and so on has first term 5 and common ratio:
Ar = 10
Br = 2
Cr = 5
Dr = 25
Answer & Solution
Correct answer: C. r = 5
1. Divide any term by the one before it.
2. 25 divided by 5 is 5.
3. So the common ratio is 5.
_Source: NCERT Class 11 Mathematics, Chapter 8, Sequences and Series._
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