Question

Find the sum of all multiples of 9 lying between 300 and 700.
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Answer 1

Step-by-step explanation:

hope you got your answer

Answer 2

Answer:

306,315,324....

a=306

an= 693

693=306+(n-1)9

387 =(n-1)9

43=n-1

44=n

sn =n/2 [2a+(n-1)d]

= 693/2[6840]

= 693(3420)

=