ABC26GN0175 · Number System

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

$1397 \times 1397=$ ?

(a)1951609

(b)1981709

(c)18362619

(d)2031719

(e)None of these

Answer

Answer (as printed): A

Explanation

$$\begin{aligned} & 1397 \times 1397=(1397)^{2}=(1400-3)^{2} \\ & =(1400)^{2}+3^{2}-2 \times 1400 \times 3=1960000+9-8400 \\ & =1951609 . \end{aligned}$$

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

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