List of top Mathematics Questions on Number System asked in CLAT

The least value of x, for which the expression \( x^2+x+17 \) will not give a prime number, is

In the number series 4, 10, 23, 50, 104, 216, 439 the wrong number is

The least value of $x$, for which the expression $x^2 + x + 17$ will not give a prime number, is