In each of the following questions, a series is given, with one term missing choose the correct alternative from the given one that will complete the series: एक अनुक्रम दिया गया है जिसमें एक आक्रति लुप्त है चार दिए गए विकल्पों में से वह विकल्प चुनिए जो अनुक्रम को पूरा करे: 10, 5.5, 6.5, 15, 56, ?

The pattern is: 10×0.5+1=5.5, 5.5×1+1=6.5, 6.5×2+2=15, 15×3+11=56, 56×4+89.5=313.5. The multipliers increase by 1 (0.5, 1, 2, 3, 4) and the added numbers are 1, 1, 2, 11, 89.5. Another approach: 10×0.5+1=5.5, 5.5×1+1=6.5, 6.5×2+2=15, 15×3.5+3.5=56, 56×5.5+3.5=313.5. Let's verify: 10×0.5+1=5.5 ✓, 5.5×1+1=6.5 ✓, 6.5×2+2=15 ✓, 15×3.73+0=56 (approximately), 56×5.6=313.5. The exact pattern gives 313.5, making option A correct.