Create interview_prep.md

Amogh Singhal · web-flow · commit 648b98c774f1 · 2020-11-30T01:06:58.000+05:30
diff --git a/interview_prep.md b/interview_prep.md
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+### 1. What is multi-collinearity
+
+When two or more predictors are highly correlated to each other such that one predictor 
+can be derived using the linear combinations of other predictors, then the predictors are said to be collinear
