Question

which term of the sequence 3,8, 13 ...................is a 78 ​

Answer 1

Step-by-step explanation:

AP=3,8,13,.............,78

a=3

d=5

Let Tn be 78

Tn=a+(n-1)d

78=3+(n-1)5

78-3=(n-1)5

n-1=75÷5

n=15+1

n=16

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