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A.P = 6,10,14,18...,174
{a}{1} = 6
d = {a}{2}-{a}{1}
d = 10-6
d = 4
Last term an = 174
= a+(n-1)d
174 = 6+(n-1)4
174 = 6+4n-4
174 = 4n+2
174-2 = 4n
172 = 4n
= n
n= 43
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