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max2010maxim [7]
3 years ago
13

What is the sum of the series?​

Mathematics
1 answer:
Mamont248 [21]3 years ago
6 0

Answer:

45

Step-by-step explanation:

Since the values are relatively small substitute i = 1 to 5 into 3i and sum

(3 × 1) + (3 × 2) + (3 × 3) + (3 × 4) + (3 × 5)

= 3 + 6 + 9 + 12 + 15

= 45

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Now, the number of seats should be in the​ non-smoking area in order to be very sure ​of having enough seating​ there :-

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