3. (-11) + (-7) + (-3) + 1 + ......... to 12 terms.
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2
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hope you understand thankyou
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a= -11
d= 4
n= 12
a12=a+(n-1) d
= -11+(12-1) 4
= -11+(11 x 4)
= -11+44
= 33
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