Latest TCS Aptitude Question SOLUTION: 1,7,8,49,50,56,57,343,344,350,351,392,393,399,400 .The above sequence contains sum of distinct power of 7 in increasing order(7^0,7^1,7^1+7^0,7^2 etc.) What is value of term number

• Placement Papers
• /
• TCS

TCS Question Papers: TCS Interview Experience(91) TCS Company Profile

(#M40029048) TCS question unsolved Keep an EYE

1,7,8,49,50,56,57,343,344,350,351,392,393,399,400 .The above sequence contains sum of distinct power of 7 in increasing order(7^0,7^1,7^1+7^0,7^2 etc.) What is value of term number 38?

Asked In TCS subhrajit mitra (11 years ago)

Unsolved Read Solution (6)

Is this Puzzle helpful?   (3)   (4) Submit Your Solution

Read Solution (6) :

JAGYANDUTTA CHOUDHURY  (11 years ago)

Best Solution :
Short Cut Method:
just represent the 38 in binary form...i.e. 100110
now convert it into base 7 = 7^5+7^2+7
just add them or check the unit digit(3)
So the ans z 16863...:)

Is this solution Helpfull? Yes (44) | No (1)  

nikhil kumar  (11 years ago)

Ans=16863
7^0=1=st term
7^1=7=2nd term
7^2=49=4th term
7^3=343=8th term of the series
similarly,
7^5=16807=32th term of the series
ATQ
series from 32nd term is
7^5,7^5+7^0,7^5+7^1,7^5+7^1+7^0,7^5+7^2,.7^5+7^2+7^0,7^5+7^2+7^1
so the 38th term is
7^5+7^2+7^1=16807+49+7=16863

Is this solution Helpfull? Yes (28) | No   

Suchira Ray  (11 years ago)

ans:-16863
38th term= 7^5+56=16863

Is this solution Helpfull? Yes (1) | No (1)  

vibhumishra  (11 years ago)

similar qus at--http://www.m4maths.com/11402-urgent-maths-question-1-7-8-49-50-56-57-343-344-350-351-392-393-399-400-The-above-sequence-contains-su.html

Is this solution Helpfull? Yes | No   

prabhakar mohan  (11 years ago)

19601..... 7^5+7^4+7^3+7^2+7^0

Is this solution Helpfull? Yes | No (4)  

Debu Singh  (11 years ago)

the ans is 16864

Is this solution Helpfull? Yes | No (3)  

Please Login to Read Solution.