Which term of the A.P. 3, 8, 13, 18, … is 78?
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The given sequence is 3, 8, 13, 18, ....78.
'a' = 3, 'd' = 5, last term = 78, 'n' = ?
t
n
=a+(n−1)d
⟹78=3+(n−1)5
⟹78=3+5n−5
⟹78=5n−2
⟹5n=80orn=16.
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Answer:
Which term of the A.P. 3, 8, 13, 18, … is 78?
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