TCS
Company
Logical Reasoning
Number Series
1,5,6,25,26,30,31,125,126...........what is the value of 30th term in the given series?
Read Solution (Total 13)
-
- 1st term gives 2nd and 3rd term as 1*5,(1*5)+1
similarly: 2nd trm gives 4th nd 5th term as 5*5,(5*5)+1
3rd term gives 6th nd 7th trm......
...................................
7th term gives 14th nd 15th term as 31*5,(31*5)+1 =155,156
thus 15th term is 156
now similrly 15th term gives 30th and 31th term as 156*5,(156*5)+1
ans. 30th term is 780. - 11 years agoHelpfull: Yes(55) No(2)
- it may be the series that aftr 1 evry term *5 ,*5+1 like the serise is 1 5 6 25 26 30 31 125 126 130 131 10 151 155 156 625 626 .............780 ,30th term=780 .is it right
- 11 years agoHelpfull: Yes(20) No(3)
- we are getting 2nd term by multiplying 5*1st term, 4th term by 5*2nd term, similarly we will get 30th term by 5*15th term..now we will get 14th term= 5*7th term=5*31=155. so 15th term=14th term+1= 155+1=156. therefore 30th term=5*156=780..
- 11 years agoHelpfull: Yes(6) No(0)
- 780.. 1*5=5,5+1=6,5*5=25,25+1=26.....31*5=155, 155+1=156 is the 15th term. so 13th term will b= 156*5=780
- 11 years agoHelpfull: Yes(2) No(3)
- sorry guys..i was wrong last tym..the answr wl be 780...
- 11 years agoHelpfull: Yes(2) No(0)
- 1,5,6,25,26,30,31,125,126,130,131,625,626,630,631,3125,3126,3130,3131,15625,15626,15630,15631,78125,78126,78130,78131,390625,390626,390630.
- 11 years agoHelpfull: Yes(1) No(6)
- I think it will be .......1755 (30th term)
- 11 years agoHelpfull: Yes(0) No(6)
- How can u explain
- 11 years agoHelpfull: Yes(0) No(2)
- answr is 5^8+1+4=390630
- 11 years agoHelpfull: Yes(0) No(3)
- 156*7=780;
- 11 years agoHelpfull: Yes(0) No(4)
- Ans will be 780.
the series is going from starting number is *5 then *5+1. - 11 years agoHelpfull: Yes(0) No(2)
- i think 136627 is ans
- 11 years agoHelpfull: Yes(0) No(6)
- the series started for (1st and 2nd) term is(1, 5) and for (nth, nth+1) terms is (((n-1)th term +1),(5*(n/2)th term)) where n is for odd term, so for 30th term(even term)= 5*((30/2)th)=5*156=780.
- 10 years agoHelpfull: Yes(0) No(0)
TCS Other Question