The given sequence is 3, 8, 13, 18, ....78. 'a' = 3, 'd' = 5, last term = 78, 'n' = ? tn=a+(n−1)d⟹78=3+(n−1)5⟹78=3+5n−5⟹78=5n−2⟹5n=80orn=16. The 16th term is 78.

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