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Read and decide which statement(s) is/are sufficient to find the value of 'n'. (1) n² - 20n + 100 = 0 (2) n² + x² + y² + 2 = 2n + 5
AOnly statement 1 is sufficient
BOnly statement 2 is sufficient
CNeither statement 1 nor 2 is sufficient
DEither statement 1 or 2 is sufficient
Answer & Solution
Correct answer: A. Only statement 1 is sufficient
1. Statement 1: n² - 20n + 100 = (n - 10)² = 0 gives a unique value n = 10, so it is sufficient.
2. Statement 2 contains extra unknowns x and y, so n cannot be uniquely determined.
3. Hence only statement 1 is sufficient.
_Source: RRB Group D CEN-02/2018 PYQ, Q.43._
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