next number of the given sequence 1, 0, -2, -9, -40, -205, ............. will be

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05 Nov 2012 sequence

next number of the given sequence
1, 0, -2, -9, -40, -205, ............. will be

OPtion

1) -438
2) -564
3) -675
4) -956
5) -987
6) -1123
7) -1236
8) -1546
9) -1856
10) none of these

Solution

1*1 - 1 = 0
0*2 - 2 = -2
-2*3 - 3 = -9
-9*4 - 4 = -40
-40*5 - 5 = -205
-205*6 - 6 = -1236

Correct Option: 7 Best Solution (12)

Govind   11 years AGO

next number of the given sequence
1, 0, -2, -9, -40, -205, ............. will be (-1236).
1*1-0=1
0*2-2=-2
(-2)*3-3=-9
(-9)*4-4 = -40
(-40)*5-5 = -205
(-205)*6-6 = -1236 .. option 7

Like? Yes (3) | No   

jai Narayan Mishra   11 years AGO

tha pattern is on following basis..
1, 0, -1*(1)-1, (-2)*3-3, (-9)*4-4, (-40)*5-5, (-205)*6-6...

Like? Yes (5) | No (2)  

Sourav   11 years AGO

use the formula for finding the n th term:
(initial value*n)-n
0,
[(0*2)-2]=-2,
[(-2*3)-3]=-9,
[(-9*4)-4]=-40,
[(-40*5)-5]=-205,
[(-205*6)-6]=-1236.

Like? Yes (3) | No (1)  

Dr.Dipin Singh   11 years AGO

-1236

1, 0, -2, -9, -40, -205, ...

(1-1)*1=0
(0-1)*2 = -2
(-2-1)*3=-9
(-9-1)*4 = -40
(-40-1)*5= -205
(-205-1)*6 =-1236

Like? Yes (2) | No   

ankushjain   11 years AGO

1
1*1-1= 0
o*2-2=-2
-2*3-3=-9
-9*4-4=-40
-40*5-5=-205
-205*6-6=-1236

Like? Yes (2) | No (1)  

Ritwik Giri   11 years AGO

1*1-1=0
0*2-2=-2
-2*3-3=-9
-9*4-4=-40
-40*5-5=-205
-205*6-6=-1236

Like? Yes (1) | No (1)  

susmit   11 years AGO

-40*5-5 = -205
- 9*4-4 = -40
- 2*3-3 = -9
0*2-2 = -2
1*1-1 = 0
therefore ANS: -205*6-6=-1236 OPTION NO. 7

Like? Yes (1) | No (1)  

ArunKumar   11 years AGO

-40 - (40*4+5) = -205
-205 - (205*5+6) = -1236
Answer = -1236

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Krishna Kumar   11 years AGO

the correct sequence is
second no.=(first no.*its position no.)-(its position no.)
i.e.
1*1-1=0
0*2-2=-2
-2*3-3=-9
-9*4-4=-40
-40*5-5=-205
-205*6-6=-1236
so correct ans. is -1236.

Like? Yes (1) | No (1)  

Vikrant Varshney   11 years AGO

this is the type of a*n-n where 'a' is no of series
as: 1*1-1=0
0*2-2=-2
(-2)*3-3=-9
(-9)*4-4=-40
(-40)*5-5=-205
(-205)*6-6=-1236 ans

Like? Yes (1) | No (1)  

krishna   11 years AGO

1->0=1*1-1
0->-2=0*2-2
-2->-9=-2*3-3
-9->-40=-9*4-4
-40->-205=-40*5-5
so answer is -205*6-6=-1236

Like? Yes (1) | No (1)  

kanhaiya lal   11 years AGO

series is like
1
1*1-1=0
0*2-2=-2
-2*3-3=-9
-9*4-4=-40
-40*5-5=-205
-205*6-6=-1236

Like? Yes (1) | No (1)