PLZ CHECK MY ANS.. IT IS -490
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given:
a=4
d=-3
s20=20/2(2*4+(20-1)*-3)
=10(8+19*-3)
=10(8-57)
=10*-49
=-490
a=4
d=-3
s20=20/2(2*4+(20-1)*-3)
=10(8+19*-3)
=10(8-57)
=10*-49
=-490
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