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