Question

The missing terms of the AP : ___, 19, ___, 7 are​

Answer 1

Answer:

a2= a + d

19 = a + d —1

a4 = a + 3d

7 = a + 3d

using elimination method

a + d = 19

a +3d = 7

- - -

—————

- 2d = 12

d = -6

put d in 1

a-6 = 19

a = 19+6

a = 25

a3= a + 2d

= 25 + 2×-6

= 25 - 12

= 13

AP = 25, 19, 13, 7

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