IBPS PO Mains 12 Oct 2025 Shift 1 Paper

Concept:Identify the pattern in each series to find the unknown terms, then compute the required ratio.Explanation:For Series A: The pattern is $\text{previous term} \times \text{multiplier} + 1$, where the multipliers are $5, 6, 7, 8$.$3 \times 5 + 1 = 16$$16 \times 6 + 1 = 97$$97 \times 7 + 1 = 680$$680 \times 8 + 1 = 5441$So, $P = 680$.Now, the 3rd term of Series B is:$3.5P + 172 = 3.5 \times 680 + 172 = 2380 + 172 = 2552$For Series B, the differences between consecutive known terms are squares of even numbers in decreasing order:$2552 - 2296 = 256 = 16^2$$2296 - 2100 = 196 = 14^2$$2100 - 1956 = 144 = 12^2$Thus, the next difference is $10^2$.$R = 1956 - 100 = 1856$Required ratio = $2552 : 1856$Divide both terms by $8$: $319 : 232$Divide both terms by $29$: $11 : 8$Answer:$11 : 8$ (Option C).