general Maths Puzzle

Find the Next Letters
PN BP KT RK ??

Read Solution (Total 2)

general Other Question

By Using the digits 1 to 9, create two numbers which when multiplied together give you the highest number.
For example, 23456789 * 1 = 23456789, clearly there are higher products. What is the highest? And what are those two numbers?
6+5+2=39
5+4+3=48
8+7+1=58
Then,
5+3+4=???