CBSE Class 10-Mathematics: Chapter –5 Arithmetic Progressions Part 7

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2 Mark Questions

Question 1:

Find the missing variable from a, d, and , where a is the first term, d is the common difference and is the nth term of AP.

(i)

(ii)

(iii)

(iv)

(v)

Answer:

(i)

We need to find here.

Using formula

Putting values of a, d, and n,

(ii)

We need to find d here.

Using formula

Putting values of a, and ,

(iii)

We need to find a here.

Using formula

Putting values of d, and ,

(iv)

We need to find n here.

Using formula

Putting values of d, and ,

(v)

We need to find here.

Using formula

Putting values of d, n and a,

Question 2:

Choose the correct choice in the following and justify:

(i) 30th term of the AP: … is

(A)

(B)

(C)

(D)

(ii) 11thterm of the AP: …is

(A)

(B)

(C)

(D)

Answer:

(i)

First term , Common difference

And

Therefore, the answer is (C).

(ii)

First term , Common difference

And (Because we need to find 11th term)