The n th term of an arithmetic sequence is 5–6n.find it's sum of n terms?
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Step-by-step explanation:
put n =1 in equation u wil get first term as a=-1.
your last term is 5-6n.and first term is -1,and total no of term is n.
sum of n term =n/2(first term+last term)
=n/2(a+5-6n)
=n/2(-1+5-6n)
=n(2-3n)
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