A.P whose nth term is 2n-1 is

A.P whose nth term is 2n-1 is

1,3,6,…

2,3,5,…

1,3,5,…

5,3,1,…

Answer : C

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1) In a certain AP, 5 times the 5th term is equal to 8 times the 8th term, then its 13th term is equal to

2) A number 15 is divided into three parts which are in AP and sum of their squares is 83. The smallest part is

5

3

6

2

3) 1,8,15,22,29,36,… is

G.P

A.P

Geometric series

arithmetic series

4) If the roots of the equation (b - c)x2 + (c - a)x + (a-b) = 0 are equal, then

2b = a + c

a = b = c

b2 = ac

none of these

5) An AP consist of 31 terms if its 16th term is m, then sum of all the terms of this AP is

16 m

47 m

31 m

52 m