# Correlation with variables with small differences in sample size

I have a sample of people, around 1140 participants but not all of them answered all questions. I have to do correlation with variables , each with different sample sizes. I have 3 variables and they have a small difference in sample size: V1 (1135), V2 (1132) and V3 (1137). Can I do correlations with such variables? If not, what is the procedure?

1. Take a random subsample of 1132 from $$V_1$$ and $$V_3$$ variables when correlating it with $$V_2$$, so that $$V_2$$ and $$V_1$$ or $$V_2$$ and $$V_3$$ have the same sample size. Note that samples are taken with replacement.