Arithmetic progressions- math quiz
1. In an A.P. 3rd term is 4 times its 1st term and 6th is 17. find
first term:
A) 2
B) 5
C) 8
D) 11
D) 11
Solution: 2
2. Which term of the series 2+5+8.......is 53.
A) 10
B) 12
C) 18
D) 20Solution: 18
3. 21st term of A.P. 11, 8, 5, 2............is
A) 49
B) -49
C) 59
D) -59Solution: -49
4. If the 9th term of an A.P. is 99 and 99th term is 9, then find
the 108th term of A.P.
A) 1
B) 0
C) -1
D) 2
Solution: 0
5. Four numbers is A.P. whose sum is 20 and sum of whose square is
120
A) 1, 3, 5, 7
B) 2,
6, 10, 14
C) 2, 4, 6, 8
D) 3, 5, 7, 9Solution:
6. series whose nth term is 1- 2n
A) 1, 3, 5, 7......
B) 2,
4, 6, 8......
C) -1, -3, -5,
-7.......
D) -2, -4, -6..........Solution: C)
7. In an A.P., if d= -4, n=7, an= 4, then a is :
A) 7
B) 6
C) 28
D) 20Solution: 28
8. The 11th term of the A.P, -5, -5/2, 0, 5/2,............ is
A) 20
B) -30
C) -20
D) 30
Solution: 20
9. which term of the A.P. 3, 10, 17.......... will be 84 ,pre than
its 13th term
A) n=25
B) n=23
C) n=22
D) n=20
Solution: n=25
10. In A.P. if a=3.5, d=0, n= 101, then an will be :
A) 3.5
B) 104.5
C) 0
D) 103.5Solution: A) 3.5
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Ravnit: plz explain questions no. 4
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