Question

mă ajutați va dau coroana și puncte​

Answer 1

bn= bn-1 + q = b1+(n-1)*q

b2=b1+q= 1+2=3

b3=b2+q= 3+2=5

b4=b3+q= 5+2=7

Sn= (b1+bn)*n/2

n= 100

b100=b1+99*q=1+99*2= 199

S100= (b1+b100)*100/2= (1+199)*50= 10.000

n= 10

b10=b1+9*q=1+9*2= 19

S10= (b1+b10)*10/2= (1+19)*5= 1.000