Class 10
Solutions of Sample Papers for Class 10 Boards

Question 1 (Choice 1) - CBSE Class 10 Sample Paper for 2022 Boards - Maths Standard [Term 2] - Solutions of Sample Papers for Class 10 Boards

Last updated at Dec. 14, 2024 by

Find the value of a 25 - a 15 for the A.P: 6,9,12,15,...........

This question is similar to Question 8 or 2nd CBSE Class 10 Sample Paper 2019 Boards

Slide1.jpeg

Slide2.jpeg

Go Ad-free

Transcript

Question 1 – Choice 1 Find the value of a25 − a15 for the AP: 6, 9, 12, 15, ……… Given A.P. 6, 9, 12, 15, ……… Thus, a = 6 & d = 9 − 6 = 3 We know that an = a + (n – 1) d Finding a25 and a15 Finding a25 a25 = a + (25 – 1) d a25 = a + 24d Putting a = 6, d = 3 a25 = 6 + 24 × 3 a25 = 6 + 72 a25 = 78 Finding a15 a15 = a + (15 – 1) d a15 = a + 14d Putting a = 6, d = 3 a25 = 6 + 14 × 3 a25 = 6 + 42 a25 = 48 Thus, a25 − a15 = 78 − 48 = 30

Davneet Singh's photo - Co-founder, Teachoo

Made by

Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo