Question

If 21, a, b, -3 are in arithmetic progression. Find the value of 'a+b' . Find the 5th term of the arithmetic progression

Answer 1

Answer:

5th term is -11.

difference is equal .

Answer 2

Answer:

Plz vote

Step-by-step explanation:

Given :-

a = 21, b = - 3

To find :-

a+b, t5

Solution :-

i) a+b = 21+(-3) = 21-3 = 19.

ii) tn = a+(n-1) d

t5 = 21 +( 5-1) d

t5 = 21 + 4 d

4d = 21-5

4d = 16

d = 16/4

d = 4.