Question

the middle term of ap 3,7,11,15 ........99 is

Answer 1

Answer:

51

Step-by-step explanation:

Tn = 3+(n-1)d

99 = 3+(n-1)4

n = 25

middle term is T13

T13 = 3 + 12d

= 3 + 12×4

= 51

Answer 2

Answer:

a= 3,d= 7-3= 4 .n=?,tn=99.

Step-by-step explanation:

tn = a+(n-1)d

99=3+(n-1)4

99=3+4n-4

4n-4=99-3

4n-4=97

4n=97+4

4n=101

n=101/4

n= 25.2

for middle term =n+1/2

25.2+1/2

26.2/2

13.1

the 13th term :

tn =a+(n-1)d

t13=3+ (13-1)2

3+12×2

3+24

27 ans.

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