Question

the sum of first five multiples is 3is _____​

Answer 1

Answer:

0.2

Step-by-step explanation:

let the no. be x

given that

x+2x+3x+4x+5x=3

15x=3

x=1/5

x=0.2

Answer 2

Answer:

75

Step-by-step explanation:

We can consider it an AP where,

first term, a= 3

common difference, d= 3

total no. of terms required, n= 5

We know,for sum of an AP(S)

S= n/2 {2a + (n-1)d}

= 5/2 {2×3 + (5-1)3}

= 5/2 { 6+24 }

= 5/2 × 30

= 5 × 15

= 75

Hope this helps you:)