find the middle terms of AP 7,13,19....21
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a=7
d=13-7
=6
a4=a+3d
=7+3×6
=7+18
=25
25 is correct answer
But your question has mistake.
d=13-7
=6
a4=a+3d
=7+3×6
=7+18
=25
25 is correct answer
But your question has mistake.
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