find the middle term of the AP:-10,7,4,............,62
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10,7,4,.......62
a=10,d=-3 ,last digit=62
a+(n-1)d=10+(n-1)3=62
n=25
a=10,d=-3 ,last digit=62
a+(n-1)d=10+(n-1)3=62
n=25
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