The sum of the first 70 positive even integers is 4,970. What is the sum of the first 70 odd integers? Pick:
A) 4500  B) 4600  C) 4300  D) 4900  E) 5000

Rationale: sum of first n even numbers = n ( n + 1 ) = 4970 sum of first n odd numbers = n ^ 2 = 70 * 70 = 4900 ( here n = 70 ) answer : d
Answer: D