WL's answer to WL's Junior College 2 H2 Maths Singapore question.
It should be 16/9(a1)² on the right side summation instead of the 4/9 (a1)². The two summations are derivee from the same GP with common ratio r = ½.
Your common ratio is -½ for i). Did you use the third term of the AP as a2 instead of -a2?
Your common ratio is -½ for i). Did you use the third term of the AP as a2 instead of -a2?
360 Tutoring Program