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Question

Find the sum of first 12 natural numbers without using the formula or by adding terms directly.


A

58

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B

78

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C

48

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D

98

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Solution

The correct option is B

78


The first 12 natural numbers are 1,2,3,4,5,6,7,8,9,10,11,12.

Let the sum be "s"

s=1+2+3+4+5+6+7+8+9+10+11+12...................(1)

We can rewrite "s" as below:

s=12+11+10+9+8+7+6+5+4+3+2+1...................(2)

Add the equations (1) and (2).we get ..

2s=13+13+13+13+13+13+13+13+13+13+13+13

2s=13×12

2s=156

s=1562

s=78


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