Question

Look at the given numbers
10, 20, 30, 40, 50, 60, 70, 80, 90.
What is the general algebraic expression to write the given numbers?

• A. 2n (n = 1, 2, 3, 4, ………)
• B. 4n (n = 1, 2, 3, 4,……)
• C. 5n (n = 1,2,3,4,……9)
• D. 10n (n = 1,2,3,4,……9)

Answer 1

The correct option is D

10n (n = 1,2,3,4,……9)

The given numbers are 10, 20, 30…….. 90.

All these are multiples of 10.

So, if we want to write 10 it can be written as 10 $\times$ 1 = 10

Same way 10 $\times$ 2 = 20

10 $\times$ 3 = 30 and so on.

Therefore, the algebraic form of these numbers can be written as,
10n (n = 1, 2, 3……)