ABC26GN0187 · Number System

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

$(24+25+26)^{2}-(10+20+25)^{2}=$ ?

(a)352

(b)400

(c)752

(d)2600

(e)None of these

Answer

Answer (as printed): D

Explanation

$$\begin{aligned} & (24+25+26)^{2}-(10+20+25)^{2}=(75)^{2}-(55)^{2} \\ & =(75+55)(75-55)=(130 \times 20)=2600 . \end{aligned}$$

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