Question

2. Choose the correct choice in the following and justify
30th term of the AP: 10.7.4,....is
(A) 97
(B) 77
(0-27
Ilth term of the AP: -3. .....is
(A) 28
(B) 22
(
0-38
2 -2.​

Answer 1

1.

To Find:-

• Find the 30th term.

Solution:-

➣ a = 10 ; d = -3

➣ tn = a + (n - 1)d

➣ t 30 = 10 + (30 - 1)-3

➣ t 30 = 10 -87

➣ t 30 = -77

2.

To Find:-

• Find the 11th term.

Solution:-

a = -3 ; d = 3

➣ tn = a + (n - 1)d

➣ t 11 = -3 + (11 - 1)3

➣ t 11 = -3 + 30

➣ t 11 = 27

Answer 2

Answers

___________________________

1) Given ,

• 30th term of AP : 10.7.4,....

To find ,

• The 30th term = ?

Solution ,

• Here , a = -10 , d = -3

We know that ,

• tn = a + (n-1)d

=> t 30 = 10 + (30-1) -3

=> t 30 = 10-87

=> t 30 = 77

____________________

2) Given,

• 11th term of the AP : -3 ...

To find ,

• the 11th term = ?

Solution ,

Here , a = -3 , d = 3

we know that ,

• tn = a+(n-1)d

=> t 11 = -3 +(11-1)3

=> t 11 = -3+30

=> t 11 = 27

____________________