Question

The middle most term (s) of the AP –11, –7, –3, ..., 45 is *​

Answer 1

Answer:

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Answer 2

Answer:

17

Step-by-step explanation:

Here ,

a = -11

d = 4

l = 45

an= a + ( n - 1 ) d

45 = -11 + ( n - 1 ) 4

45 = -11 +4n -4

45 = -15 + 4n

60 = 4n

n = 60 / 4

= 15

since the number of terms are odd

the middle term ca be found by the formula n+1 / 2

=> 15 + 1 / 2

=> 16 / 2

=> 8

a8 = a + 7d

= -11 + 7 ( 4 )

= -11 + 28

= 17 .

hence the middle term is 17

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