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Ashutosh rai

· started a discussion

· 1 Months ago

how (Question: 248595.0 )

n=1 kha put krna hai????

Question:
Find the sum to n terms of the series, 5 + 55 + 555 + _____
Options:
A) \(\cfrac{5}{81}(10^n-1)-n\)
B) \(\cfrac{5}{81}(10^n-1)-\cfrac{5n}{9}\)
C) \(\cfrac{50}{81}(10^n-1)-\cfrac{5n}{9}\)
D) \(\cfrac{5}{9}(10^n-1)-\cfrac{5n}{81}\)
Solution:
Ans: (c) 


Vaibhav Yadav

· commented

· 1 Months ago

n=1 means take first term ( i.e = 5) and now put n=1 in options , whichever gives 5 will be answer,
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