The middle term of an ap is 52. Find the sum of its first and last term
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first term = a , last = a + (n-1)d
sum = 2a + (n-1)d
= 2 ( a + (n-1)d/2)
= 2 ( a + (n/2 -1/2)d)
middle term = a+ (n/2-1 )d
Step-by-step explanation:
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