यदि R019 11 से विभाज्य है, तो न्यूनतम प्राकृत संख्या R का मान ज्ञात कीजिये। A. 5 B. 6 C. 7 D. 8

A number is divisible by 11 when the difference between the sums of alternate digits is 0 or a multiple of 11. In R019: (R + 1) − (0 + 9) = R − 8. This is 0 when R = 8, so the smallest such R is 8 (8019 = 11 × 729).