Question

(8) The sum of the first five multiples of 3 is ...​

Answer 1

Answer: Please mark it as brainliest

45

Step-by-step explanation:

a = 3 ( first term)

d = 6-3 = 3 ( second term - first term = common difference )

L = 15 ( last term )

Sn = n/2 (a + L )

Sn = 5 /2 ( 3 + 15 )

Sn = 5/2 ( 18 )

Sn = 5 ( 9 )

Sn = 45

Answer 2

The first 5 multiples of 3 are:-

3×1=3

3×2=6

3×3=9

3×4=12

3×5=15

The sum of first 5 multiples of 3 is =3+6+9+12+15=45

Your Answer:-

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