11. Which term of the AP:3, 8, 13, 18.......
.... is 78?
Answers
Answered by
1
Answer:
tn = a +(n-1)d,
=> 78 = 3 + (n-1)5,
=> (n-1)5 = 75,
=> n-1 = 15,
=> n = 16.
therefore,
16th term is 78
Answered by
1
Step-by-step explanation:
First of all we find d
so d=a2-a1
d=8-3
d=5
and
an=a+(n-1) d
we have to found
a78=a+(n-1) d
a78=3+(78-1) 5
a78=3+77×5
a78=3+385
a78=388
I hope it helps you........
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