Q12 of 167 Page 20

Mark the correct alternative in the following:

If are in A.P. with common difference d, then the sum of the series , is


Here,a1, a2,…,an are in A.P.


Then d=a2-a1=a3-a2=…=an-an-1







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10

Mark the correct alternative in the following:

If are in A.P. with common difference d, then the sum of the series sin d is


A.


B.


C.


D.


11

Mark the correct alternative in the following:

In the arithmetic progression whose common difference is non-zero, the sum of first 3 n terms is equal to the sum of next n terms. Then the ratio of the sum of the first 2 n terms to the next 2 n terms is


 13

Mark the correct alternative in the following:

If four numbers in A.P. are such that their sum is 50 and the greatest number is 4 times the least, then the numbers are


 14

Mark the correct alternative in the following:

In n arithmetic means are inserted between 1 and 31 such that the ratio of the first mean and nth mean is 3 : 29, then the value of n is