Question

what is the sum of the first 7 multiple of 5 ​

Answer 1

Answer:

ans= 140

Step-by-step explanation:

S7= n/2(2a+(n-1)d)

=7/2(2*5+(7-1)*5)

=7/2(10+6*5)

=7/2(10+30)

=7/2*40

=7*20

=140...

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Answer 2

Answer:

Hope this answer helps