चिह्नों के सही सम्मुचय का चयन कीजिए: 27_3_19_10 = 90

Try each set: with ×, +, − we get 27 × 3 + 19 − 10 = 81 + 19 − 10 = 90, which is correct. The other sets do not give 90, for example 27 + 3 − 19 ÷ 10 = 28.1.