Trying to find the right answer to this..

We have, a n = 3n + 5 a 1 = 3(1) + 5 = 3 + 5 = 8 a 2 = 3 (2) + 5 = 6 + 5 = 11 And, a 3 = 3 (3) + 5 = 9 + 5 = 14 Now, common difference = a 2 – a 1 = 11 – 8 = 3.

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

Arithmetic Progressions

Short Answer Type

271. The nth term of an A .P. is 7 – 4n find its common difference.

96 Views

272. Write the common difference of an A .P. whose nth term is 3n + 5.

We have, a_n = 3n + 5
a₁ = 3(1) + 5 = 3 + 5 = 8
a₂ = 3 (2) + 5 = 6 + 5 = 11
And, a₃ = 3 (3) + 5 = 9 + 5 = 14
Now, common difference = a₂ – a₁ = 11 – 8 = 3.

100 Views