NCERT Exemplar Solutions
Class 10 - Mathematics - CHAPTER 5: Arithematic Progressions - Exercise 5.1Question 18
Class 10 - Mathematics - CHAPTER 5: Arithematic Progressions - Exercise 5.1
Question. 18
The sum of first five multiples of 3 is
(A)
45
(B)
55
(C)
65
(D)
75
Detailed Answer with Explanation:
Step 1: A multiple of 3 means a number that comes in the table of 3.
Step 2: The first five multiples of 3 are: \(3, 6, 9, 12, 15\).
Step 3: Now, add them one by one:
\(3 + 6 = 9\)
\(9 + 9 = 18\)
\(18 + 12 = 30\)
\(30 + 15 = 45\)
Step 4: Therefore, the sum of the first five multiples of 3 is \(45\).