If the Sum `50 + 45 + 40 + 35 +`________ is zero, then the number ofterms is :

Number of zeros at the end of 45! is:

The sum of first 50 even numbers is

The sum of a number and its reciprocal is 50/7 ,then the number is

The prime number between 40 and 50:

The number of observation in a group is 40. If the average of first 10 is 4.5 and that of the remaining 30 is 3.5, then the average of the whole group is

The number of observations in a group is 40. If the average of first 10 is 4.5 and that of the remaining 30 is 3.5 then the average of the whole group is

The number of ovservations in a group is 40. If the average of first 10 is 4.5 and that of the remaining 30 is 3.5, then the average of the whole group is :

The number of observation in a group is 40. If the average of first 10 is 4.5 and that of the remaining 30 is 3.5, then the average of the whole group is