Sn=2a1+(n-1)d/2 * nS50=2*6+(50-1) *4/2 * 50=5200d=a2-a1=10-6
Sn = (a1 + an) * n / 2
an = a1+d(n - 1)
d=10-6=4
a50=6+4(50-1)= 202
S50=(2+202)*50/2=5100
Sn=2a1+(n-1)d/2 * n
S50=2*6+(50-1) *4/2 * 50=5200
d=a2-a1=10-6
Sn = (a1 + an) * n / 2
an = a1+d(n - 1)
d=10-6=4
a50=6+4(50-1)= 202
S50=(2+202)*50/2=5100