find the sum of -3, 1, 5...... to 17 terms
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a=-3
n=17
d=t2-t1
1-(-3)
d =4
tn=?
t17=a+16d
=-3+(16*4)
=-3+64
t17=61
s17= n/2(a+tn)
=17/2*(-3+61)
s17= 493
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