check wether the given
sequence are in AP or not 4, 15 19, 23........
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Answer:
a=4
d= a2 - a1
= 15-4
= 11
d= a3 - a2
= 19-15
= 4
d= a4 - a3
= 23-19
= 4....
As a2-a1 doesn't equal to a3-a2......
It doesn't form an AP.....
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