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aditya

· started a discussion

· 1 Months ago

soln (Question: 248595.0 )

put n = 1 and check option

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) 


Kundan Kumar

· commented

· 1 Months ago

Thanks..bro.next time these types of questions save me two minutes

Kamaal Akhtar

· commented

· 1 Months ago

Check first term by putting n=1 in the options. The option giving 5 as answer will be the required answer.

Ashutosh rai

· commented

· 1 Months ago

kha put kre n=1

Knowledge Expert

· commented

· 1 Months ago

Dear Student,
You can go with this approach, its a shortcut.
But we here provide general solutions to the problems.

Thanks and Regards
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