Home GATE Question of the Day GATE Question of the Day - General Aptitude Question GATE Question of the Day - General Aptitude Question personExamsavvy 9:45 PM 15 share The sum of n terms of the series 4+44+444+------ is Please give the reason for your answer. All the best Tags GATE Question of the Day Facebook Twitter Whatsapp Newer Older
option C....just take 4 as common and take the g.p of the terms ... we will get the answer..
ReplyDeleteIt's C
ReplyDeleteIts just as easy as substituting value of 'n' and checking options.
if it is right post me...
ReplyDeleteyaaa checking is easy... bt we can do it through process also
ReplyDeleteya from my knowledge answer is "c"! but i have doubt on this?
ReplyDeletedude may i know what is that?
ReplyDeleteyah it is C because it is in the geometric progression
ReplyDeletehey after a stong confirmation i found the right answer the same option "C"
ReplyDeleteoption c......
ReplyDeletesimple trick is that put only n=o,then we see that all term become zero.which only in case option c.so don't waste your time use short trick.
Option C
ReplyDeleteyaa... put n=o.. den only in c ol terms wil be zero... so ans. is "C"
ReplyDeleteans iz c
ReplyDeleteAnswer to this question is option C
ReplyDeletethis question is very easy.put n=1 then u will get the 4...so option c
ReplyDeletesum= 4+44+444+.........+tn
ReplyDeletesum= 4+ 44+.........+tn-1+tn
subtracting above two equations we get
0=4+40+400+.............+(tn-tn-1)-tn
tn=(4+40+400+...n terms)
tn=4*(10^(n)-1)/(10-1) -- G.P summation
sum=sigma of tn
sum=4/9*(sigma of 10^(n)-sigma of 1)
sum=4/9*[10*(10^(n)-1)/(10-1)-n]
sum=option 'C'