Analysis and Approaches for IBDP Maths Ebook 1 | Page 69

Front Page
(c)
(ii) Case 1: m �� 6
�6
r �
3 �� ( 6)
(M1) for finding r
2
r ��
3
A1
Case 2: m � 7
�6
r �
3 � 7
3
r �
2
A1 N3
(i)
2
r �� leads to a finite sum.
3
A1
2
As �1� � � 1. 3
R1 N0
(ii) u1 � 3 � ( � 6)
(A1) for finding u
1
u1 � 9
(A1) for correct value
u1
S �
1� r
9
S �
�
A1
� 2 �
1� � � �
� 3 �
27
S �
�
5
A1 N3
[6]
[6]
6
www.seprodstore.com
61