ABC26GN0188 · Number System

Subject: General Aptitude · Chapter: Number System · Exam: · Marks: · Difficulty:

$(65)^{2}-(55)^{2}=$ ?

(a)10

(b)100

(c)120

(d)1200

Answer

Answer (as printed): D

Explanation

$(65)^{2}-(55)^{2}=(65+55)(65-55)=(120 \times 10)=1200$.

Explanation as extracted from the printed page; notation may be imperfect.

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