Arithmetic progression?????....
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a=18
d=-3
sn=45
sn=n/2(2a+(n-1)d)
45=n/2(2×18+(n-1)-3)
45=n/2(36-3n+3)
90=n(39-3n)
90=39n-3n^2
3n^2-39n+90
factorise it u will get the answer
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