a1= - 4
a2= -2
n=10
d=a2-a1=-2-(-4)=2 S10=2a1+(n-1)*d\2 *n
S10=2*(-4)+9*2\2 *10= -8+18\2 *10=50
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a1= - 4
a2= -2
n=10
d=a2-a1=-2-(-4)=2 S10=2a1+(n-1)*d\2 *n
S10=2*(-4)+9*2\2 *10= -8+18\2 *10=50