Question

write all the possible numbers between 800 and 900 which have 6 in the tens place​

Answer 1

Answer:

Number of palindromes between 800 to 900: First digit has only one possibility since it can't occupy other than “8”. Second digit has ten

Answer 2

Concept:

There are two basic principles of counting:

1. The fundamental principle of counting is to assume that an event X can happen in n different ways and another event Y can happen in m different ways. The sum of the occurrences of two events is equal to m x n.

2.Addition principle: The occurrence of events X or Y is equal to m + n when event X occurs in m different ways and event Y occurs in n different ways and neither event can occur simultaneously.

Given:

800 and 900 which have 6 in the tens place

Find:

Write all the possible numbers between 800 and 900 which have 6 in the tens place

Solution:

Using fundamental principle of counting,

Let there be three places

_  _  _

First place will be filled with 8, so no.of possibilities is 1

Second place will be filled with 6, so no.of possibilities is 1

Third place can be filled with any number, so number of possibilities  is 10

So, possible numbers between 800 and 900 which have 6 in the tens place​ is 1x1x10= 10

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