If $\begin{bmatrix}a \:\: 7 \:\:\:b\:\:\:9\\… | ClassNotes

ClassNotes

Human-reviewed study resources for board exams, entry tests, and structured practice across notes, MCQs, flashcards, and past papers.

Support: [email protected]

Business: [email protected]

North America: +1 (512) 666-1423

Asia / MENA: +92 340 9170227

We typically reply within 3 business days.

Explore

Classes
Posts
MCQs
Flashcards
Search

Company

About
Contact
Tutors
Editorial Standards

Policies

Privacy Policy
Terms of Use
Cookie Policy
Refund Policy
Shipping Policy

© 2026 ClassNotes Inc. All rights reserved.

API Status: checking

Allen, Texas and Lahore, Pakistan. Public support pages are available for privacy, terms, cookies, refunds, shipping, and editorial standards.

Command Palette

Search for a command to run...

Shop
Tutors

If $\begin{bmatrix}a \:\: 7 \:\:\:b\:\:\:9\\… | ClassNotes

E

Editor

Sep 18, 2022

If $\begin{bmatrix}a \:\: 7 \:\:\:b\:\:\:9\\ \end{bmatrix}=\begin{bmatrix}3\: \: 12 \:\:\:c\:\:\:18\\ \end{bmatrix}$, then b=?

Difficulty: Easy

A:

12

B:

c

C:

a

D:

9

ID: 63273dbaca83163ac3a11a6f