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Sum of nth them formula |
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Answer» n/2 ( 2a + ( n-1)d) or n/2 ( a+l ) Nth term= n/2[2a+(n-1)d] or =n/2(a+l) N/2 [2a+(n-1)d] N/2(2a+(n-1)d) N/2(a+(n-1)d) |
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