Question

find ap whose 10th term is 5 and 18th term is 77

Answer 1

Answer:

here is the answer..

Step-by-step explanation:

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Answer 2

Hey !!

GIVEN THAT,

      10th term is 5

Now, applying nth term formula a + (n - 1)d

a + ( 10 - 1 )d = 5

a + 9d = 5       ---------> (1)

Now, 18th term is 77

Now, applying nth term formula a + ( n - 1)d

 a + ( 18 - 1 )d = 77

 a + 17d = 77 ---------> (2)

Now, from (2) and (1)

    8d = 72

d = 72/8

  d = 9    

Now, substituting the value d = 9 in equation in (1)

Therefore,

    a + 9(9) = 5    

  a + 81 = 5  

a = 5 - 81  

    a = -76

THEREFORE THE A.P IS -76 , -67    

GOOD LUCK !!