Find the sum of the following series 72+70+68+_ _ _ _ +40
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a1= 72,a2,70,,,,,,,,a17=40
total no. of terms is 17
the common difference is -2
by the formula (n/2)* ((2a)+(n-1)d) gives sum of all
therefore, (17/2)((2*72)+(17-1)(-2))=952
total no. of terms is 17
the common difference is -2
by the formula (n/2)* ((2a)+(n-1)d) gives sum of all
therefore, (17/2)((2*72)+(17-1)(-2))=952
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