Question

4. Which term of the AP:3, 8, 13, 18,...,is 78?​

Answer 1

Step-by-step explanation:

a=3 d= 5

general term of ap is a+(n-1)d

78 = 3+ 5n -5

78= 5n -2

80= 5n

n= 16

16 th term of ap is 78

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Answer 2

Answer:

a=3,d=8-3=5,an=78

putting the value the formula an=a+(n-1)d

78=3+(n-1)5

75/5=n-1

15+1=n

hence, not = 16