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<script>
// Function to generate OTP
function generateOTP() {
// Declare a digits variable
// which stores all digits
var digits = '0123456789';
let OTP = '';
for (let i = 0; i < 4; i++ ) {
OTP += digits[Math.floor(Math.random() * 10)];
}
return OTP;
}
document.write("OTP of 4 digits: ")
document.write( generateOTP() );
</script>