Find the 25th term of -5, -2.5, 0,......
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solution
find =à25
a25=a+24d ,
d=a2-a1 =-2.5-(-5)
d=-2.5+5=2.5
a25=a+24d
=-5+24(2.5)
=-5+60=55
therefore a25=55
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