Which term of AP: 3,8,13,18,......78?
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Answer:
Which term of AP: 3,8,13,18,......78?
Step-by-step explanation:
☆ Given:-
AP:- 3,8,13,18,...,78 , where a=3, d=5, aₙ=78.
☆ To Find:-
nth term of AP(which term of AP is 78).
☆ Formula Applied:-
aₙ=a+(n-1)d
aₙ=a+(n-1)d , where aₙ=78, a=3, d=5.
⇒ 78=3+(n-1)(5)
⇒ 78-3=5n-5
⇒ 75+5=5n
⇒ 5n=80
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