Correct option is A
Given: 313 ÷ 4 − 2107 × 7 + 24 = ?
‘+’ and ‘–‘ are interchanged
‘×’ and ‘÷’ are interchanged
After interchanging the sing, we get following equation-
313 × 4 + 2107 ÷ 7 - 24 = ?
313 × 4 + 301 - 24 = ?
1252 + 301 - 24 = ?
1553 - 24 = ?
1529 = ?
Thus, the correct answer is (a) 1529.