Question

please answer these question​

Answer 1

(ii) 1+2+3+_ _ + 50

$\boxed {sum \: = \frac{1}{2} n(n + 1)}$

$\: \: \: \: \: \: \: \: \: \: \: \: = \frac{1}{2} (50 \times 51)$

$\: \: \: \: \: \: \: \: \: \: \: \: = 1275$

(iii) 31 + 32 + 33 + _ _ + 50

$sum \: = \frac{1}{2} (50 \times 51) - \frac{1}{2} (30 \times 31)$

$\: \: \: \: \: \: \: \: \: \: = 1275 - 465$

$\: \: \: \: \: \: \: \: \: \: = 810$

Answer 2

Answer:

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Step-by-step explanation:

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