Question

what's next ?
15, 35,75, 155 315,?
(1) 635
(2) 675
(3) 665.
(4) 645​

Answer 1

Answer:

The pattern is: 15 then 1×2+1&5=35....75.....155.....315

315. =31×2+1&5= 635

(1)635

Answer 2

Answer:

(1) 635

Step-by-step explanation:

We are given the series

15 , 35 , 75 , 155 , 315 ___

To Find :

Next term of the series.

Solution :

Given series 15 , 35 , 75 , 155 , 315 ,...

By Observing the series we get that the first term is 15 and second term is 35 of the given series.

since 15 x 2 + 5 = 35

         35 x 2 + 5 = 75

         75 x 2 + 5 = 155

         155 x 2 + 5 = 315

         315 x 2 + 5 = 635

Hence the series is

 15 , 35 , 75 , 155 , 315 , 635

so option(1) is the correct answer.

#SPJ2