Question

Find the sum of 51 term of the ap whose second term is 2 and the 4th term is8

Answer 1

Answer:

3774

Step-by-step explanation:

a + d = 2

a +3d = 8

2d = 6

d = 3

a+3 = 2

a = -1

51 term = -1 + 50×3 = 149

Sum = (51/2)(-1+149)

= 51× 74

= 3774

Answer 2

Answer:

hey :)

Step-by-step explanation:

//Answer//

Step-by-step explanation:

a + d = 2

a +3d = 8

2d = 6

d = 3

a+3 = 2

a = -1

51 term = -1 + 50×3 = 149

Sum = (51/2)(-1+149)

= 51× 74

= 3774