Question

please answer this question ​

Answer 1

Step-by-step explanation:

solution

common ratio is r=-4 a=50 n-1=10 res 9

put formula tn

Answer 2

Series is 50,46,42...

First term = 50.

Common difference = 4

Sum of n terms of AP :

Sn = (n/2)[2a + (n - 1) × d]

S10=10/2[2*50+(10-1)*-4]

=>5(100+9*-4)

=>5(100-36)

=>5*64

=>320

Hence sum of 10 terms = 320.