A manof 50 years old has 8 sons born at equal intervals.the sum of ages of the father and the 8 sons is known to be 186 years.Calculate the age of the eldest son,if the youngest son is 3 years old.
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S8 = 186-50= 136
136 = 8/2 ( 2*3+7d )
d = 4
T8 = a+7d
=31
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