you can just find what the 4 th and 5th terms are then add them up Do you see the pattern?
how do you get from 400 to 200 and from 200 to 100? what process is done on 400 and 200 to get the next number?
and what would you do to 100 to get the next number in the series?
would the answer be 25?
No how could it be 25? S5 means the Sum of 5 terms
Oh i don't know. so what would the answer be
to get the next term in the series you multiply by 0.5 400 * 0.5 = 200 200 * 0.5 = 100 so what are the next 2 terms?
0.5 * 100 = ?
100 * 0.5 = 50 50 * 0.5 = 25
exactly so you have the first 5 terms so all you have to do is add them up 400+ 200 etc
can you do that S5 = 400+200+100+50+25
yes i got it thank you