Question

. What is the sum of first 10 multiples
of 9

90
495
900

990 ​

Answer 1

Answer:

Let S = 9 + 18 + ..... +90 ..... (i)

Also, S =90 + 81 +...... 9 ...... (ii)

Adding two equations, we get

2S = 99 + 99 + ..... 10 times.

or, S = 99 x 10 /2

or, S = 495.

Therefore, Sum of first 10 multiples of 9 is 495.

Step-by-step explanation:

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Answer 2

Answer:

Sum of first 10 multiples of

1) 9=495

2) 90=4950

3) 495=27225

4) 900=49500

5) 990=54450

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