Write the first 5 terms of each of the following sequences.

$\displaystyle t_{n+2} = t_{n}+t_{n+1}, t_{1}= 3, t_{2}=7, n=1, 2, 3...$

The answers are supposed to be 3,7,10,17,27.

Though why 27?

I've got a test on this today, so please hurry with responses.

any help will be appreciated. please show all working out.