4. Which term of the AP:3, 8, 13, 18,…,is 78?
5
Find the number​

2 thoughts on “4. Which term of the AP:3, 8, 13, 18,…,is 78?<br />5<br />Find the number​”

1. Step-by-step explanation:

   Given

   AP: 3 , 8,13,18,..is 78?

   a = 3

   d = 8-3 = 5

   an = l = 78

   n = ?

   [tex]\fbox \red{an = a +( n – 1)d}[/tex]

   [tex]78= 3 + (n – 1)5[/tex]

   [tex]78 – 3 =( n – 1)5[/tex]

   [tex] \frac{75}{5} = n – 1[/tex]

   [tex] n = 15 + 1[/tex]

   [tex]\fbox \green{n = 16}[/tex]

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2. Answer:

   2nd term is 5

   I hope it is correct

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