Question

which term of the AP 3,8,13,15.....is75
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Answer 1

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.

Answer 2

a = 3

d = 5

ant = a + (n-1)d

Step-by-step explanation:

let ant = 75

75 = 3 + (n-1)5

72/5 = n-1

no .. term cant be in fractional value..

So..75 is not a term of this Ap