Question

Sequence is 1,2,4,7,11,16.......n find the nth term plz solve .. if u solved it i will mark u as brainiest

Answer 1

Answer:

AP does not exist.

Step-by-step explanation:

Answer 2

Answer:

1/2n²-1/2n+1

Step-by-step explanation:

since we can see that the difference between the no. are increasing and we get a constant in its second time difference ....thus eqn should be of the form an²+bn+c..

by putting the values from eqn

a(1)²+b(1)+c= 1 ...... i

a(2)²+b(2)+c=2

a(3)² + b(3) + c= 4

by solving the eqns you would get  a=(1/2)

b=(-1/2)

c=1

hence,your required ans is, 1/2n²-1/2n+1

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