<option*ngFor="let date of monthArray;let i = index;"[attr.value]="i+1"[selected]="(wizardData&&wizardData.vechile_info&&wizardData.vechile_info.maintanenceInterval)?wizardData.vechile_info.maintanenceInterval ==i+1:''">{{i+1}}{{(i === 0)?' Month':' Months'}}</option>
<option*ngFor="let date of monthArray;let i = index;"[attr.value]="i+1"[selected]="wizardData.vechile_info.maintanenceInterval ==i+1">{{i+1}}{{(i === 0)?' Month':' Months'}}</option>