Which planets do not have satellites revolving

The HCF and LCM of two consecutive even number is 2 and 112 respectively. Find the sum of reciprocal of these two numbers?

The least number which when divided by 4, 8, 10 and 12 leave zero remainder in each case and when divided by 13 leaves a remainder of 9 is:

The L.C.M of a² – 2a – 3 and a³ + a² + a + 1 is 

Find the greatest number that will divide 550, 675 and 500 without leaving a remainder.

If total number of factors of 5,292 is 'x', then find the value of (x - 7)(x + 2).

The least number which when divided by 4, 6, 10 and 12 leave zero remainder in each case and when divided by 13 leaves a remainder of 8 is:

If the total number of factors of 1250 is 'y', then find the value of (y - 4)(y + 7).

Three numbers are in the ratio 2:3:6 respectively. If the HCF of the numbers is 5, then find the LCM of the numbers.