Question

5.If a=10 and d=10, then first four terms will be: *

A)10,30,50,60
B)10,20,30,40
C)10,15,20,25
D)10,18,20,30​

Answer 1

Answer:

10,18,20,30 is fourth term

Answer 2

The first four terms will be 10 , 20 , 30 , 40

Given :

a = 10 and d = 10

To find :

The first four terms will be

A) 10,30,50,60

B) 10,20,30,40

C) 10,15,20,25

D) 10,18,20,30

Concept :

If in an arithmetic progression

First term = a

Common difference = d

Then nth term of the AP

= a + ( n - 1 )d

Solution :

Step 1 of 2 :

Write down first term and common difference

Here it is given that a = 10 and d = 10

First term = a = 10

Common Difference = d = 10

Step 2 of 2 :

Find first four terms

First term = a = 10

Second Term = a + d = 10 + 10 = 20

Third term = a + 2d = 10 + 20 = 30

Fourth term = a + 3d = 10 + 30 = 40

The first four terms will be 10 , 20 , 30 , 40

Hence the correct option is

B) 10 , 20 , 30 , 40

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