in an ap if the first term is 22 the common difference is -4 and the sum of n term is 64 find n
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sn = n/2 { 2a + (n- 1) d }
64 = n/2 { 44 + (-4n + 4 )}
128 = 44n - 4n^2 + 4n
128 = 4n^2 + 48n
4n^2 + 48n -128
solving the equation by using splitting term we will get the answer...
hope it helps you!!!!
64 = n/2 { 44 + (-4n + 4 )}
128 = 44n - 4n^2 + 4n
128 = 4n^2 + 48n
4n^2 + 48n -128
solving the equation by using splitting term we will get the answer...
hope it helps you!!!!
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