The sum of first 12 terms of the AP -37. - 33, - 29... is
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Step-by-step explanation:
a= -37
d= -33-(-37)
d= -33+37
d= 4
n=12
Sn=n/2 [2a+(n-1)d]
S12=12/2 [2 (-37)+11 (4)]
=6×[-74+44]
=6×[-30]
= -180
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