Question

Find the middle term of an ap . -11, -7, -3, _____, 49 when a= - 11,d=4

Answer 1

Answer:

1, 5, 9, 13, 17, 21, 25, 29, 33, 37, 41, 45, 49.

Step-by-step explanation:

Given,

Series = -11, -7, -3, ........ 49.

First term a = -11

Difference d = 4

Find the number of terms.

tn = a + (n - 1) d

49 = -11 + (n - 1) 4

49 + 11 = (n - 1) * 4

60 = (n - 1) * 4

40 / 4 = n - 1

10 = n - 1

11 = n

-11 + 4  = -7

-7 + 4 = -3

-3 + 4 = 1

1 + 4 = 5

5 + 4 = 9

9 + 4 = 13

13 + 4 = 17

17 + 4 = 21

21 + 4 = 25

25 + 4 = 29

29 + 4 = 33

33 + 4 = 37

37 + 4 = 41

41 + 4 = 45

45 + 4 = 49

Mark me brainliest :)