Question

Which term of an ap 3,8,13,18,............Is 78

Answer 1

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Here given,

a=3

d=8-3=5

an=78

We know that,

an= a+(n-1)d

78=3+(n-1)5

78-3=(n-1)5

75/5 = n-1

15+1=n

hence, n= 16....ans

Answer 2

The correct answers is here