Question

how many two digit no. are divisible by 3??​

Answer 1

There are infinite numbers divisible by 3.

You should mention between which numbers..

Answer 2

Answer:

↪ 30

Step-by-step explanation:

↪ List of two digit numbers which are divisible by 2 :-

• 12, 15, 18, .. , 99

↪ This is an arithmetic progression :-

• a (first term) = 12
• d(common difference) = 15 - 12 = 3
• aₙ = 99

↪ Sum of n terms of an AP :-

• aₙ = a + (n - 1)d
• 99 = 12 + (n - 1)3
• 87 = (n - 1)3
• n - 1 = 87/3
• n - 1 = 29
• n = 30

∴ 30 two digit numbers are divisible by 3.