Question

hi friends plz help me...​

Answer 1

1)

$1) \\ sum = \frac{20}{2} (2 \times 3 + 19 \times 2) \\ = 10(6 + 38) \\ = 10 \times 44 \\ = 440 \\ \\ 2)sum = \frac{23}{2} (2 \times 16 + 22 \times ( - 5)) \\ \\ = \frac{23}{2} (32 - 110) \\ \\ = \frac{23}{2} \times ( - 78) \\ \\ = 23 \times ( - 39) \\ \\ = - 897$

Answer 2

Step-by-step explanation:

Here is ur answer................