Rate me 1/10 lol I think I’m a 3.5

How many grams must be adde to 970g to make 1 and a half kg

Successful implementation of a new system is based on three independent modules. module 1 works properly with probability 0.96. for modules 2 and 3, these probabilities equal 0.95 and 0.90. compute the probability that at least one of these three modules fails to work properly.

Can someone me do math because i am having a breakdown rn because i don’t get it