sum of all numbers between 200 and 30 which are divisible by 6
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=> l = a + ( n - 1 ) d
=> 399 = 203 + ( n - 1 ) 7
=> 399 - 203 = ( n - 1 ) 7
=. 196 = ( n - 1 ) 7
=> 196 / 7 = ( n - 1 )
=> 28 = ( n - 1 )
=> n = 28 + 1 = 29
Hence the number of terms is 29.
Applying Sum formula we
see in picture
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