Wellcome!

Question 1. Asked on :24 August 2019:09:16:21 PM

#### Find the sum of the first 25 multiples of 7.

-Added by Prince Rawat Mathematics » Arithmetic Progressions

Master Mind

The A.P. : 7, 14, 21, ..............

Now We have to find 7 + 14 + 21 + ........... 25 terms

∴ a = 7, d = 7 n = 25

Sn = n2 {2a + (n - 1)d}

S25 = 252 {2 × 7 + (25 - 1)7}

= 252 {14 + (24)7}

= 252 (14 + 168)

= 252 × 182

= 25 × 91

Hence the sum of first 25 multiple of 7 is 2275.

-Answered by Master Mind On 24 August 2019:11:38:04 PM(5952Average Rating Based on rating)

You can see here all the solutions of this question by various user for NCERT Solutions. We hope this try will help you in your study and performance.

This Solution may be usefull for your practice and CBSE Exams or All label exams of secondory examination. These solutions or answers are user based solution which may be or not may be by expert but you have to use this at your own understanding of your syllabus.

#### What do you have in your Mind....

Our Expert Team reply with answer soon.

* Now You can earn points on every asked question and Answer by you. This points make you a valuable user on this forum. This facility is only available for registered user and educators.

Next moment you answer is ready .... go ahead ...

## Search your Question Or Keywords

#### Do you have a question to ask?

User Earned Point: Select

## All Tags by Subjects:

Science (1906)
History (200)
Geography (296)
Economics (157)
Political Science (95)
Mathematics (195)
General Knowledge (5431)
Biology (93)
Physical Education (20)
Chemistry (118)
Civics (114)
Home Science (12)
Sociology (8)
Hindi (43)
English (247)
Physics (1422)
Other (92)
Accountancy (176)