Apps. and Interpretation for IBDP Maths Ebook 1 | Page 265

2. Events A and B are independent with P( A��B) � 0.15 and P( B) � 0.3 .
(a) Find P( A� B)
.
(b) Find P( A ) .
(c) Find P( A� B)
.
[2]
[2]
[2]
3. Events A and B are independent with P( A�B�) � 0.28 and P( A) � 0.4 .
(a) Find P( A� B)
.
(b) Find P( A� B)
.
[2]
[4]
4. Events A and B are independent with P( A�B) � 0.21 and P( A) � 0.7 .
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(a) Find P( B ) .
(b) Show that P( A�B) � 0.79 .
(c) Find P( A�� B�)
.
[2]
[2]
[3]
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