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Here's the solution to Question 1:
Question 1
(a) Sets
The universal set . So, .
(i) List the elements of P and Q. Step 1: List the elements for P and Q. Prime numbers in are numbers greater than 1 that are only divisible by 1 and themselves. Multiples of 3 in are numbers in that can be divided by 3.
(ii) Find P Q and P Q. Step 2: Find the union and intersection of P and Q. The union (P Q) includes all unique elements from both sets. The intersection (P Q) includes elements common to both sets.
(iii) Find the value of n(P Q)ΚΉ. Step 3: Find the complement of P Q and its number of elements. First, count the number of elements in P Q: . The universal set has elements. The complement consists of elements in but not in . The value of is .
(iv) Represent P and Q on a clearly labelled Venn diagram. Step 4: Draw the Venn diagram. β’ Draw a rectangle for the universal set . β’ Draw two overlapping circles for P and Q. β’ Place the common element (3) in the intersection. β’ Place the remaining elements of P in the P-only region. β’ Place the remaining elements of Q in the Q-only region. β’ Place elements from that are not in P or Q outside the circles but inside the rectangle.
Β΅
+-------------------------------------+
| 1, 4, 8, 10, 14, 16, 20 |
| |
| +-------+ +-------+ |
| | P | | Q | |
| | 2, 5, | | 6, 9, | |
| | 7, 11,| | 12,15,| |
| | 13,17,| | 18 | |
| | 19 | | | |
| +---3---+---+-------+ |
| |
+-------------------------------------+
(b) Simple Interest
Kwame invested GHS 4,500 at 8% per annum. Total amount was GHS 6,300. Principal (P) = GHS 4,500 Amount (A) = GHS 6,300 Rate (R) = 8% = 0.08
(i) Calculate the simple interest earned. Step 1: Calculate the simple interest. Simple Interest (I) = Amount (A) - Principal (P)
(ii) Find the number of years Kwame kept the money in the account. Step 2: Use the simple interest formula to find the time (T). The formula for simple interest is (where R is a percentage).
(iii) What annual rate would have yielded the same interest in 3 years? Step 3: Use the simple interest formula to find the new rate (R). We want the same interest (I = GHS 1,800) with Principal (P = GHS 4,500) and Time (T = 3 years).
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This languages problem is solved step by step below, with detailed explanations to help you understand the method and arrive at the correct answer.