Question

Find the sum of 20 terms of the AP √2, 2√2,3√2,...

Answer 1

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Answer 2

Step-by-step explanation:

first term a = √2

commen difference

d = 2√2 - √2

=√2(2-1)

= √2

Formula : an = a+(n-1)d

A20 = √2 + (20 - 1) × √2

= √2 + 19√2

√2(1 + 19)

= 20√2