(i) How many terms of the AP : \(24, 21, 18, . . .\) must be taken so that their sum is \(78\)?
Required number of terms \(=\) or
(Note: Enter the answers in ascending order)
(ii) Find the sum of first \(18\) terms of the list of numbers whose \(n^{th}\) term is given by \(a_n= 4 + 5n\)
Sum of the first \(18\) terms \(=\)