Question

How many numbers are there 1 to 400 which are divisible by 3 not 11?

Answer 1

Least no. which is divided by 3 is 3 and the greatest digit under 400 to be divided by 3 is 399

here  a = 3 (first term)  a₂ = 6

n = number of terms and d =  3  (common difference)

Formula = Aⁿ = a + (-1)d

399 = 3 + (n-1) 3

399=3 + 3n -3

399 = 3-3 + 3n

399 = 3n

n = 399/3

n = 133

133 Numbers are divisible by 3 .

That's if friend

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Answer 2

Step-by-step explanation:

number of numbers between 1 to 400 / 3 will be 399 by 3 that will be 133

33 is a number which is divisible by both 11 and three so have to find the multiples of 33 between one to 400

i.e 400/33= 12

so numbers divided by 3 but not by 11 between 1 to 400 are 133-12 = 121