In each number except 383, the product of first and third digit is the middle one.
More questions
1. A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series. Abcd, ghIJ, Mnop, stUV, Yzab, ?
4. A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series. XXXOXXX, XXXXOXX, XXOXXXX, XXXXXOX, XOXXXXX, ?