Please solve either on mobile or a copy The sum of first 11 terms of an AP whose middle term is 30, is
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n=11
So,
If we take
a-5d,a-4d,a-3d, …........ ,a+5d
Then
a=30 we will get,
Sum of all terms,
a-5d+a-4d+........ +a+5d= 11a=11x30=330 (ans)
So,
If we take
a-5d,a-4d,a-3d, …........ ,a+5d
Then
a=30 we will get,
Sum of all terms,
a-5d+a-4d+........ +a+5d= 11a=11x30=330 (ans)
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