A) 7
B) 6
C) 31
D) 26
Correct Answer: C
Solution :
Factors of\[=25={{5}^{2}}\]are 1, 5, 25 which can also be represented as: \[{{5}^{2}}=(2+1)=3\](i.e.3 factors) \[\frac{{{5}^{n+1}}-1}{5-1}=\frac{{{5}^{2+1}}-1}{5-1}=\frac{125-1}{4}=\frac{124}{4}=31\,\]
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