(a) The first term of an Arithmetic Progression is -8, the last term is 52 and the sum of terms is 286. Find the: number of terms in the series; (b) The fir...

Assessment: WAEC SSCE - Further Mathematics - 2023 (Essay) Subject: Further Mathematics

Question 1 Report

(a) The first term of an Arithmetic Progression is -8, the last term is 52 and the sum of terms is 286. Find the:

number of terms in the series;

(b) The first term of an Arithmetic Progression is -8, the last term is 52 and the sum of terms is 286. Find the:

common difference.

Answer Details

(a) a=8;l=52;n=?

\(S_n=\frac{n}{2}(a+l)=286\)

\(=\frac{n}{2}(-8+52)=286\)

\(=\frac{n}{2}(44)=286\)

=22n=286

\(∴n=\frac{286}{22}=13\)

(b) l = a + (n - 1)d = 52

= -8 + (13 - 1)d = 52

= -8 + 12d = 52

= 12d = 52 + 8

= 12d = 60

\(∴d=\frac{60}{12}=5\)

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