Which term of the A.P: 3, 8, 13, 18, ……, is 78?

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Chandan Singh

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tn = a + (n - 1) d 78 = 3 + (n - 1)5 78 = 3 + 5n - 5 78 = - 2 + 5n 78 + 2 = 5n 80 = 5n 80/5 = n 16 = n n= 16
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