Practice Problems (Junior Cert Mathematics): Flashcards

Difference between consecutive terms

$5$

$T_n = a + (n-1) \cdot d$

$T_n = 5n - 2$

$98$

$15th$ term

Constant (equal) second differences

$T_n = an^2 + bn + c$

$a$ = half of second difference

$T_n = n^2 + 3$

$103$