alleryWhat is the square of 349?
A122801
B122881
C121801
D120801
Answer & Solution
Correct answer: C. 121801
1. Write 349 as (350 − 1).
2. (350 − 1)² = 350² − 2·350 + 1 = 122500 − 700 + 1.
3. This equals 121801.
_Source: RRB Group D (RRC) PYQ, held 27-10-2013, Q.18._
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