Find the sum first 20 consecutive natural numbers.

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Arithmetic Progression

Question:

Find the sum first 20 consecutive natural numbers.

A200

B210

C220

D205

Answer:

B. 210

Explanation:

sum first n consecutive natural numbers =n(n+1)/2 sum first 20 consecutive natural numbers = 20(21)/2 = 10 × 21 = 210

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