alleryIf a_n = n(n+2), the third term of the sequence is:
- 8
- 15
- 12
- 18
Show answer and solution
Correct answer: B. 15
a_3 = 3(3+2) = 15.
NDA Arithmetic Progression — practice questions
Explore 4 free Arithmetic Progression questions in NDA Mathematics. Open each question or exercise to read its content, reference answers and available explanation.
Practise Arithmetic Progression with Quill →Arithmetic Progression questions and exercises with answers
Showing questions 1–4 of 4.
If a_n = n(n+2), the third term of the sequence is:Read the answer and worked solution →For the sequence a_n = n/(n+1), the fifth term equals:Read the answer and worked solution →For a_n = 2^n, the sum of the first three terms is:Read the answer and worked solution →For a_n = (2n−3)/6, the value of a_4 is:Read the answer and worked solution →
Worked practice questions
For the sequence a_n = n/(n+1), the fifth term equals:
- 5/6
- 4/5
- 6/7
- 1
Show answer and solution
Correct answer: A. 5/6
a_5 = 5/(5+1) = 5/6.
For a_n = 2^n, the sum of the first three terms is:
- 12
- 10
- 14
- 8
Show answer and solution
Correct answer: C. 14
2+4+8 = 14.
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