Subject - Mathematics:

Arithmetic Progression

MCQ - 455-9187

Question:

If a_n denotes the nth term of the AP 3, 8, 13, 18, ... then what is the value of (a30 - a20)?

Correct Answer: C

Explanation:

Here, First term = a = 3
Common difference = d = 8 - 2 = 5
To find: a₃₀ – a₂₀
So, n^th term is given by:
a_n = a + (n - 1)d
∴ 30^th term is:
a₃₀ = 3 + (30 - 1) × 5
= 3 + 145
= 148
Now, 20^th term is:
a₂₀ = 3 + (20 - 1) × 5
= 3 + 95
= 98
Now, (a₃₀ – a₂₀) = 148 - 98
= 50
∴ (a₃₀ – a₂₀) = 50

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504 MCQ for effective preparation of the test of Arithmetic Progression of Mathematics section.

Read the MCQ statement: If an denotes the nth term of the AP 3, 8, 13, 18, ... then what is the value of (a30 - a20)? , keenly and apply the method you have learn through the video lessons for Arithmetic Progression to give the answer. Record your answer and check its correct answer and video explanation for MCQ No. 455-9187.

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