Answer / owais masood

Series of prime numbers, before 19 it certainly is 17..

Answer / nilambari

answer is 17

Answer / jagathesh&achu

oder of prime numbers is given..
19,23,29,31 all are prime numbers(it can divisible only by
1 and that respective number)
before 19 there is a question mark so identify before 19
which number is prime..
18 is not prime number so ANSWER MUST BE 17.

Answer / r bhattacharyay

it should be 17

Answer / gopi

Answer is 17

Answer / prahlad

17
obviously

Answer / sundari

answer is 17

Answer / jijal

11

Given a collection of points P in the plane, a 1-set is a point in P that can be separated from the rest by a line; i.e. the point lies on one side of the line while the others lie on the other side. The number of 1-sets of P is denoted by n1(P). The maximum value of n1(P) over all configurations P of 19 points in the plane is 18 9 3

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