Question

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

Answer 1

Step-by-step explanation:

16th term

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Answer 2

First term of AP = a = 3

Common difference = d = Second term - First term
= 8 - 3
= 5

Last term = an ( please note that it is that n is written down right in small font of letter a ) = 78

last term = first term + (number of terms - 1) common difference

Let n be the number of terms

an = a + (n-1)d

78 = 3 + (n-1) 5

78 - 3 = 5n - 5

75 + 5 = 5n

80 = 5n

n = 80/5 = 16

=> The 16th term of the AP is 78

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