Question

WIU II ne umerende between their 1000th terms ?
21. (i) How many two digit numbers are divisible by 3 ?
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Answer 1

Answer:

easy total 30 numbers are divisible by 3

Step-by-step explanation:

first two digit number is that divisible by 3 is 12 and last two digit number is 99...

now apply formula...

12+(n-1)3=99

12+3n-3=99 :(12-3=9)

3n=99-9

3n=90

n=90/3

n=30

Answer 2

Answer:

The list of two-digit numbers divisible by 3 are :

12,15,18...,99

Here, a= 12 ,d = 3, $a_n$= 99

$a_n = a +(n-1)d,$

99= 12+(n-1) ×3

87 =(n-1)×3

$n-1 = \frac{87}{3} = 29$

n = 29+1 =30