Sum of 42 odd numbers is?  Choose the correct choice from the following options
A) 1764
B) 1774
C) 1784
D) 1794
E) 1754

Rationale: "sum of 1 st n odd no . s = 1 + 3 + 5 + 7 + . . . = n ^ 2 so , sum of 1 st 42 odd numbers = 42 ^ 2 = 1764 answer : a"
Answer: A