Question 36Asked in BPSC TRE 2.0 (2023) Computer Science Class 11-12+ 11 more papers
If X = a² − b², Y = 30 and a + b = 15, then
AX is lesser than Y if a = b
BX is greater than Y if a > b
CY is greater than X if a = b
DMore than one of the above
ENone of the above
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Correct answer: (D) More than one of the above
Explanation
X = (a + b)(a − b) = 15(a − b). If a = b, X = 0 < 30 = Y, so (A) and (C) are both true. If a > b, X can still be less than 30 (e.g. a − b = 1), so (B) is not always true.
From BPSC TRE 2.0 (2023) Computer Science Class 11-12 — Previous Year Paper