find the sum of all multiples of 9 lying between 300 and 700

1.	find the sum of all multiples of 9 lying between 300 and 700
Answer» The multiples of 9 lying between 300 and 700 are 306, 315,………, 693.This is an AP with a = 306, d = 9 and l = 693.Suppose these are n terms in the AP. Then,

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