Latest CAT Aptitude Question SOLUTION: In this series 1212212221222212222212222221..... find the sum of first 1234 trems

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(#M40024836) CAT question Number System Keep an EYE

In this series
1212212221222212222212222221.....
find the sum of first 1234 trems

Asked In CAT prayas goel (10 years ago)

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pappu gupta  (10 years ago)

we may write it as 1+(20+1)+(200+20+1)+(2000+200+20+1).......
now., (1+1+1+..1234 times +20+200+2000..each 1233 times)
so, 1234+ 1233*2(10+100+1000+....form a Gp)

so acco to me ansr should,,1234+2466*10((10^1233-1)/10-1)
i used sum of Gp formula.
i don't knw its right or wrong,guys plz giv ur suggestions

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rajeswari.y  (10 years ago)

n(n+1)/2=10

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