Find the value of 1 + 2 + 3 + 4 + 5 + 6.

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Solution

The correct option is B 21
Find: 1 + 2 + 3 + 4 + 5 + 6

First term = 1, second term = 2, third term = 3, fourth term = 4, fifth term = 5, sixth term = 6

Sum of first and sixth terms = 1 + 6 = 7
Sum of second and fifth terms = 2 + 5 = 7
Sum of third and fourth term = 3 + 4 = 7

So, 1 + 2 + 3 + 4 + 5 + 6 = 7 $\times$ 3
1 + 2 + 3 + 4 + 5 + 6 = 21

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