Question

what is the sum of first six multiples of 6

Answer 1

Answer:

126

Step-by-step explanation:

First six multiples of 6 :

6 * 1 = 6

6 * 2 = 12

6 * 3 = 18

6 * 4 = 24

6 * 5 =30

6 * 6 =36

So, the sum of first 6 multiples of 6 = 6+12+18+24+30+36

                                                          = 126

Hence the sum of first six multiples of 6 is 126

Answer 2

Answer:

The sum of first six multiples of 6 is 90.

Step-by-step explanation:

The first six multiples of 6 are: 6,12,18,24,30.

Therefore the sum of first six multiples of 6 = 6+12+18+24+30= 90.

One other alternative to solve this question is by arithmetic progression:

The A.P = 6,12,18,24,30.

Here, a=6, d= 12-6 = 6

We know that sum of n terms of an A.P = (n/2)[2a + (n- 1)d]

By substituting the values of a, n and d we get,

5/2[2.6 + 4.6] = 2.5(36) = 90.