Question

in the given question
a=2 d=5 find S20​

Answer 1

Step-by-step explanation:

$sn = \frac{n}{2} \times ({2a +( n - 1) \times d}) \\ \\ s20 = \frac{20}{2 } \times (2 \times 2 + 19 \times 5) \\ = 10 \times 99 \\ 990$

Answer 2

Answer:

990

Step-by-step explanation:

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