ans this it's urgent
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a = 1
d is finding by subtract 2nd term to the 1st term
means,8-1
d = 7
So
hey to find t1 t2 t3 ......
we have to apply formula
tn=a(n -1)d
t1 = a+ d=8
t2=a+1d=8
t3=a+2d=15
t2-t3=8-15
= -7
t3-t2=15-8
=7
d=7 ......
hope this will help you
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