Ared string of holiday lights blink once every 3 seconds, while a string of blue lights blink once every 4 seconds how many times will both set of lights blink at the same time in one minute?

The sum of the first eight terms of an arithmetic progression is 9m + 14. the fifth term of the06 progression is 2m - 6, where m is a constant.given that the first term of the progression is 26,find the value of the common difference, d and thevalue of m.