Question

what is the answer please tell​

Answer 1

Answer:

S4

S12

S50

S100

Step-by-step explanation:

Put the value of n in Sn's value

Answer 2

Answer:

n=4, Sn= 4+8+12+..

n=12, Sn=12+24+36+..

n=50,Sn=50+100+150+200+..

n=100,Sn=100+200+300+..

Hope it helps