Question

1+2+3+4+5+6+7+8+9+10=

Answer 1

Answer:

55

Step-by-step explanation:

1+2+3+4+5+6+7+8+9+10=55

Answer 2

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55

Step-by-step explanation:

let the last number of series be n

then, their sum is,

$\frac{n(n+1)}{2}$

n=10

then,

$\frac{10 \times (10 + 1)}{2} \\ \frac{10 \times 11}{2} \\ \frac{110 }{2} \\ \\ = 55$

or we can add this manually

$1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 \\ = (1 + 9) + (2 + 8) + (3 + 7) + (6 + 4) + 5 + 10 \\ = 10 + 10 + 10 + 10 + 10 + 5 \\ = 50 + 5 \\ = 55$