1. The nth term of an A.P. whose 1st term is „a‟ and common difference is „d‟ is:
(A) 2a + (n + 1)d
(B) a + (n + 1)d
(C) a + (n – 1)d
(D) a + (d – 1)n
2. The nth term of an A.P. 1, 4, 7, …… is:
(A) 17
(B) 19
(C) 21
(D) 23
3. If a, b, c are in A.P. then:
(A) b – a = c – b
(B) b/c = a/b
(C) a + b = b + c
(D) a/b = c/a
4. The 10th term of 7, 17, 27, …… is:
(A) 97
(B) 98
(C) 99
(D) 100
5. The sum of n terms of an A.P. with „a‟ as 1st term and „d‟ as common difference is:
(A) n/2 [a + (n – 1)d]
(B) n/2 [2a + (n – 1)d]
(C) n/2 [a + (n + 1)d]
(D) n/2 [2a – (n – 1)d]
6. Arithmetic mean between x–3 and x+3 is:
(A) x
(B) 2x
(C) 3
(D) –3
7. If Sn = n² + n + 1 then its 4th term will be:
(A) 21
(B) 40
(C) 41
(D) 101
8. Arithmetic mean between –7 and 7 is:
(A) 7/2
(B) –7/2
(C) 0
(D) 14
9. The sum of the series 1 + 2 + 3 + …… + 100 is:
(A) 100
(B) 5000
(C) 5050
(D) 500
10. The nth term of a G.P a, ar, ar², …… is:
(A) ar²
(B) arn+1
(C) a r^(n–1)
(D) arn–1
11. The 5th term of a G.P 1, 1/2, 1/4, …… is:
(A) 1/8
(B) –1/8
(C) 1/16
(D) 1/32
12. The 6th term of G.P 1, 2, 4, …… is:
(A) 4
(B) 8
(C) 16
(D) 32
13. The G.M. between a and b is:
(A) ±√(ab)
(B) ab
(C) ±ab
(D) √(ab)
14. If x, y, z are in G.P. then:
(A) 2y = x + z
(B) 2y = xz
(C) y² = xz
(D) z² = xy
15. Geometric mean between 3 and 27 is:
(A) –9
(B) 12
(C) 15
(D) ±9
16. The sum of n terms of a geometric series a + ar + ar² + ……; |r| < 1 is:
(A) (ar^(n–1))/(1–r)
(B) a(1–r^n)/(1–r)
(C) (ar^(n+1))/(1–r)
(D) a(r–1)/(1–r)
17. The sum of 6 terms of the series 1 + 2 + 4 + …… is:
(A) 63
(B) 64
(C) 65
(D) 66
18. The sum of 5 terms of the series 1 – 2 + 4 …… is:
(A) 16
(B) 11
(C) –11
(D) –16
19. The sum of infinite terms of a G.P. a, ar, ar², …… if |r| < 1 is:
(A) a/(1–r)
(B) a(1–r^n)/(1–r)
(C) arn–1
(D) None of these
20. The sum of infinite geometric series 1 + 1/3 + 1/9 + …… is:
(A) 3/2
(B) –3/2
(C) 2/3
(D) –2/3