self Maths Puzzle

What is the next number in this series?
4, 6, 12, 18, 30, 42, 60, 72, 102, 108,?

Read Solution (Total 1)

next number will be 138.

4, 6, 12, 18, 30, 42, 60, 72, 102, 108,?

3 and 5 are prime... middle number is 4
5 and 7 are prime.. middle no is 6
..
..
.107 and 109 are prime numbers.. middle number is 108.

next number is 138 as 137 and 139 are prime numbers.

series will be

4, 6, 12, 18, 30, 42, 60, 72, 102, 108,138,150
12 years agoHelpfull: Yes(5) No(0)

self Other Question

From a box containing a dozen bulbs, of which exactly one half are good, and four bulbs are chosen at random to fit into the four bulb holders in a room. The probability that the room gets lighted is If a+ (1)/a+2 =0, then value of (a+2)^3 +(1)/(a+2)^3 is