Question

Find the sum of the integers between 100 and 500 that are divisible by 9

Answer 1

Answer:

Step-by-step explanation:

Please see the attachment below.

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Answer 2

Step-by-step explanation:

AP= 108,117,.....,495

a=108, d=9

an=a+(n-1)d

495= 108+(n-1)9

387=9(n-1)

387=9n-9

n=44

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

=44/2[2x108+(44-1)x9]

=22[216+387]

Sn= 13266