Question

1+2+3+4+5+6+7+8+9+10+11+12​

Answer 1

Answer:

78

Explanation:

$\frac{1 + 12}{2} \times 12$

$= 78$

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Answer 2

Answer:

the answer is 78

Explanation:

add the last and the first number, then the last but one number and the 2nd number and so on.

u will get the same total everytime.

this is an easy way to find the sum of consecutive numbers.

hope it helped..!