Write the formula for sum when 'a' and 'd' are given?
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Sn=n/2(2a+(n-1)*d)
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when a and d are given the formula for summation is,
Sn = n/2( a + ( n - 1 ) d )
hope it helps....
and if you have any query then tell me
Sn = n/2( a + ( n - 1 ) d )
hope it helps....
and if you have any query then tell me
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