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20 Sep 2019 : Series

Find the twelfth term of below series is:
-1, 7, 5, 21, 19, 43, 41, .....

OPtion

1) 167
2) 169
3) 171
4) 121
5) 109
6) 177
7) 157
8) 110
9) 144
10)None of these

Solution

1^2 - 2 = -1
2^2 + 3 = 7
3^2 - 4 = 5
4^2 + 5 = 21
5^2 - 6 = 19
6^2 + 7 = 43
7^2 - 8 = 41
8^2 + 9 = 73
9^2 - 10 = 71
10^2 + 11 = 111
11^2 - 12 = 109
12^2 + 13 = 157

Correct Option: 7 Best Solution (4)

Best user's solution

Khanna

The series will be
-1,7 (-1+1*8) ,5 (7-2) ,21( 5+2*8),19,43 ( 19+3*8), 41 (43-2) ,73 (41+4*8) ,71, 111 (71+40) ,109,157(109+48)
12th term in series is 157.. option 7

Is this solution helpfull? Yes (2) | No   

SAYAN CHATTERJEE

the trend is -2+8*n
so, the 12th term is 41+32-2+40-2+48= 157
Option 7.

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

K.Bhaskar

-1,7,5,21,19,43,41,73,71,111,109,157,155

Is this solution helpfull? Yes | No (1)  

Sukanya

-1 5 7 21 19 43 41 73 71 111 109 157

Is this solution helpfull? Yes | No (1)