Which term of the AP ; 5, 11, 17, 23, . . . . is 125?
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Answer:
d=11-5=6 , d=17-11=6
an=125
a+(n-1)d=125
5+(n-1)6=125
(n-1)6=125-5
n-1=120/6
n=20+1
n=21
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