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  • tn for the sequence 2,9,28,65,126 ....... isOption: 1 </div

tn for the sequence 2,9,28,65,126 ....... is

Option: 1

t_n= n^2+1


Option: 2

t_n= n^3-2


Option: 3

t_n= n^3+1


Option: 4

None of these 


Answers (1)

best_answer

By observation 

t_1 = 1^3+1

t_2 = 2^3+1

t_3 = 3^3+1 and so on ......

So t_n = n^3+1

Alternate method

Checking options

(a) t_1 = 1^2+1=2

t_2 = 2^2+1=5, so wrong similarly other option may be checked.

Posted by

chirag

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