Math, asked by rfia, 1 year ago

find the nth term of the 2,4,9,16,25

Answers

Answered by ChankitSaini
5
Hey Mate here's the solution...

You can't use the formula a+(n-1)d for exactly the reason that you give (d changes).  The formula is ONLY for arithmetic sequences where d remains constant.

The sequence 2,4,9,16,25, ... is not arithmetic, but 2,4,9,16,... are perfect squares.  

a1 = 2 = √2²

a2 = 4 = 2²

a3 = 9 = 3², etc

So, we could define the sequence as an = (n+1)², for n = 1,2,3,... 
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