Question

FROM CHAPTER arithmetic progression

class 10


DETEMINE THE AP whose third of two term is 16 and the 7th term exceeds the 5th term by 12.​

Answer 1

Answer:

Let a be the First term, a3 be the third term, a5 be the 5th term and a7 be the 7th term

a3 = 16

a7 = a5 + 12 ............ (1)

Let the common difference be "d"

Common difference is equal in AP

So,

a7 = a5 + d + d = a5 + 2d ............(2)

From Equation (1) & (2)

a5 + 12 = a5 + 2d

2d = 12

d = 6

From Given, we get that

a3 = 16

a3 = a + 2d = 16

a + ( 2 × 6 ) = 16 [ We know that d = 6 ]

a + 12 = 16

a = 4

So first term is 4 .... We can find AP by adding d continuously

So, AP is 4, 10, 16, 22, 28.......

Answer 2

Hey User !!!

Let a be the First term, a3 be the third term, a5 be the 5th term and al be the 7th term

a3 = 16

a = a5 + 12..........................................(1)

Let the common difference bed"

Common difference is equal in AP

So,

a7 = a5 + d +d a5+ 2d....................(2)

From Equation (1) & (2)

a5 + 12 = a5 + 2d

2d = 12

d = 6

From Given, we get that

a3 = 16

a3 = a + 2d = (6

a + (2 x 6) = 16 we know that d=6

a + 12 = 16

a = 4

So first term is 4 . We can find AP by adding d continuously

So, AP is 4,10,16,22,28

Hope it helps !!!