Question

The sum pf 2nd and 19th element of arithmetic progression is equal to sum of 8th,12th and 15th element of the progression. Which element in the series must be equal to zero

Answer 1

Answer:

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Answer 2

Answer:

14th element of series must be zero

let say ap is

a , a+d , a+2d ......

2nd =a + d

19th = a + 18d

sum =2a + 19d

8th = a+7d

12th = a+11d

15th = a+14d

sum = 3a + 32d

2a + 19d = 3a + 32d

a + 13d =0

14th element = 0

14th element of series must be zero