3) Find the value of t, + ty for the A. P: 7, 13, 19, 25,
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Explanation: a (first term ) = 7
d (common difference) = t2 -t1 = 13-7 = 6
n = 19
tn = a + ( n - 1 ) d
t19 = 7 + ( 19 - 1 ) 6
t19 = 7 + 108
t19 = 115 Answer
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