find 25th term of an A P. -5, -5/2, 0, 5/2 ,....
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nth term tn=a+(n-1)d. here,n=25,a= -5,d=t2-t1= -5/2-(-5)= -5/2+5= -5/2. now put the values in formula.....t25=. -5+(25-1)(-5/2)= -5+(24)(-5/2)= -5-60=. -65 is the ans
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N=25
D= 2.5 or 5/2
A=-5
A25= a+24d
A25=-5+24×2.5
A25=5+60
A25=65
25 term is 65
D= 2.5 or 5/2
A=-5
A25= a+24d
A25=-5+24×2.5
A25=5+60
A25=65
25 term is 65
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