Question

Sum of the first 4 terms of an AS is 72. Sum of the first 9 terms
is also 72. (5)
a) What is the 5 th term of the sequence
b) Find the sum of the first 5 terms of the sequence
c) Write the sequence

Answer 1

a n =5n  2 +2n

(a) First term =5(1)  2  +2(1)=5+2=7

Sum of the first two terms =5(2)  2 +2(2)=20+4=24.

(b) First term =7

Second term =24−7=17.

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