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Rd Chapter 9- Arithmetic Progressions Ex-9.4 Interview Questions Answers

Question 1 :
(i) 10th term of the A.P. 1, 4, 7, 10, ………
(ii) 18th term of the A.P. √2 , 3√2 , 5√2 , ……….
(iii) nth term of the A.P. 13, 8, 3, -2, ……..
(iv) 10th term of the A.P. -40, -15, 10, 35, ……..
(v) 8th term of the A.P. 117, 104, 91, 78, ………..
(vi) 11th term of the A.P. 10.0 , 10.5, 11.0, 11.5, ……….
(vii) 9th term of the A.P. 3/4 , 5/4 , 7/4 , 9/4 , ………

Answer 1 :


Question 2 :
(i) Which term of the A.P. 3, 8, 13, …… is 248 ?
(ii) Which term of the A.P. 84, 80, 76, ….. is 0 ?
(iii) Which term of the A.P. 4, 9, 14, ….. is 254 ?
(iv) Which term of the A.P. 21, 42, 63, 84, ….. is 420 ?
(v) Which term of the A.P. 121, 117, 113, ….. is its first negative term ?

Answer 2 :

(i) A.P. is 3, 8, 13, …, 248
Here first term (a) = 3
and common difference (d) = 8 – 3 = 5

Question 3 :
(i) Is 68 a term of the A.P. 7, 10, 13, …… ?
(ii) Is 302 a term of the A.P. 3, 8, 13, ….. ?
(ii) Is -150 a term of the A.P. 11, 8, 5, 2, …… ?

Answer 3 :


Question 4 :
How many terms are there in the A.P. ?
(i) 7, 10, 13, … 43
(ii) -1, – 5/6 , – 2/3 , – 1/2 , …….., 10/3
(iii) 7, 13, 19, …, 205
(iv) 18, 15(1/2) , 13, …, -47

Answer 4 :