The instalments form an arithmetic progression. The sum of an A.P. is ( S_n = \dfrac{n}{2}\bigl[2a + (n-1)d\bigr] ).
Accedmychevron_right11thchevron_rightmathchevron_rightSequences And Serieschevron_rightExercise 6.11
The instalments form an arithmetic progression. The sum of an A.P. is ( S_n = \dfrac{n}{2}\bigl[2a + (n-1)d\bigr] ).