Question

the nth term of the sequence 0,2,6,12,20 can be expressed as​

Answer 1

Answer:

Step-by-step explanation:

Given

the nth term of the sequence 0,2,6,12,20 can be expressed as

There is a pattern for the sequence 2,4,6,8,10….. So in this case the nth term will be 2 n

Now n = 0 1 2 3 4

So n(n + 1)/2 = 1,3,6,10,15

We can see from this the required sequence is double the one which is nth term. Therefore the nth term for the sequence will be 2 n (n + 1) / 2 = n(n + 1).

Answer 2

Answer:an=2n2-1

Step-by-step explanation: