The 7th term of an AP is -4 and its 13 th term is -16.find the AP
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Step-by-step explanation:
a^7=-4
a+6d=-4. ----(1)
a^13=-16
a+12d=-16. ----(2)
by subtracting (1) from(2) we get
-6d=12
d=-2
putting value of d in (1)
a+6d=-4
a+(6*-2)=-4
a-12=-4
a=-4+12
a=8
A.P:-
a,a1,a2.......
8,a+d,a+2d.....
8,8+(-2),8+2*(-2)....
8,6,4......
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