Question

complete the siries 78,65 ,52........

Answer 1

in this series

13 is subtracted

so the series will be

78 , 65 , 52 , 39 , 26 , 13 , 0 .....

Answer 2

Given Series is 78,64, 52..

Here,

⇒ First term a = 78.

⇒ Common difference d = 64 - 78

                                         = -13.

We know that nth term of the AP is an = a + (n - 1) * d.

4th term of the AP is:

⇒ a4 = a + (4 - 1) * d

         = 78 + 3 * (-13)

         = 78 - 39

         = 39.

Therefore, the next number in the series is 78,65,52,39.

Hope this helps!