18,15(1)/(2),13,...,-47

Find the sum: 25+28+31+.+100 (ii) 18+15(1)/(2)+13++(-49(1)/(2))

The 11th term of the A.P. 13,15(1)/(2),18,20(1)/(2),....... is :

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

18/15 x 1.2

Calculate the covariance of observation (3,5), (6,7),(9,9), (12,11), (15,13), (18,15), (21,17), (24, 19) using assumed mean A = 13 and B = 12.

How many terms are there in the A.P? 7,\ 10 ,\ 13 ,\ 43. (ii) -1,\ -5/6,\ -2/3,\ -1/2,\ ddot,(10)/3dot (iii) 7,\ 13 ,\ 19 ,\ ddot,\ 205 . (iv) 18 ,\ 15 1/2,\ 13 ,\ ddot,\ -47 .

Find the number of terms in each of the following APs : (i) 7, 13, 19, . . . , 205 (ii) 18 ,\ 15 1/2,\ 13 ,\ dot\ dot\ dot\ ,\ - 47

In the data 18, 13, 15, 13, 18, 14, 15, 13, 14, 15, how many times the number '15' repeats itself?

If alpha and beta are the roots of the equation, [1,5][(1,3),(-4,7)]^(2)[(7/19, -13/19),(4/19,1/19)]^(4) [(1,3),(-4,7)]^(2)[(x^2 - 5x + 5),(-3)] = [-4] , then the value of (2 - alpha)(2 - beta) is

11th term of an A.P. is 13, 15 1/2, 18, 20 1/2, ……… is :