The 7th term of a.p x-4 and 13th tetm is -16.find the a.p.
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Step-by-step explanation:
a3=7
a+2d=7............(1)
a7=3(a3)+2
a+6d=3(7)+2
a+6d=23............(2)
BY SUBTRACTING (1) AND (2)
a+2d=7
a+6d=23
-4d=-16
d=16/4
d=4
IF d=4 THEN a=
a+2d=7
a+2(4)=7
a+8=7
a=-1
a20=a+19d
=-1+19(4)
=-1+76
=75
SO, 25th term of an AP is 75
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