Now it is ng -v
If you are useing angular cli then you can check useing
ng --version
Now it is ng -v
Or you can also check in
pakage.json file
"dependencies": {
"@angular/animations": "^4.0.0",
"@angular/common": "^4.0.0",
"@angular/compiler": "^4.0.0",
"@angular/core": "^4.0.0",
"@angular/forms": "^4.0.0",
"@angular/http": "^4.0.0",
"@angular/platform-browser": "^4.0.0",
"@angular/platform-browser-dynamic": "^4.0.0",
"@angular/router": "^4.0.0",
"angular-in-memory-web-api": "^0.3.2",
"core-js": "^2.4.1",
"rxjs": "^5.1.0",
"zone.js": "^0.8.4"
},