Series Completion Reasoning MCQs for Competitive Examination What should come in place of the question mark(?) in the following series? Q. 15, 8, 20, 34, 76, 142, ? (A) 284 (B) 302(C) 296 (D) 272 Show Answer/Hide Answer Answer: (C) 296Explanation: 5*2-2, 8*2+4, 20*2-6, 34*2+8, 76*2-10, 142*2+12 Q. 25, 9, 18, 43, 92, 213, 382, ? (A) 328 (B) 617(C) 382 (D) 671 Show Answer/Hide Answer Answer: (D) 671Explanation: 5+2², 9+3², 18+5², 43+7², 92+11², 213+13², 382+17²…(2, 3, 5, 7, 11, 13, 17, …are being consecutive prime numbers. Q. 34, 10, 27, 140, ? (A) 379 (B) 973(C) 937 (D) 397 Show Answer/Hide Answer Answer: (B) 973Explanation: 4*2+2, 10*3–3, 27*5+5, 140*7-7 Q. 43, 27, 243, 2187, ? (A) 27139 (B) 13561(C) 21377 (D) 19683 Show Answer/Hide Answer Answer: (D) 19683Explanation: 3, 3*9, 27*9, 243*9, 2187*9 Q. 53, 14, 29, 38, 51, 58, 69, ? (A) 74 (B) 37(C) 73 (D) 47 Show Answer/Hide Answer Answer: (A) 74Explanation: N/A Q. 66, 24, 60, 120, ? (A) 216(B) 240(C) 210(D) 186 Show Answer/Hide Answer Answer: (C) 210Explanation: 1*2*3=6, 2*3*4=24, 3*4*5=60, 4*5*6=120, 5*6*7=210 Q. 716, 30, 62, 122, 246, ? (A) 490 (B) 488(C) 492 (D) 494 Show Answer/Hide Answer Answer: (A) 490Explanation: 16*2-2, 30*2+2, 62*2-2, 122*2+2, 246*2-2 Q. 87, 11, ? , 31, 47 (A) 29 (B) 55(C) 5 (D) 19 Show Answer/Hide Answer Answer: (D) 19Explanation: 2*2+2, 6*2+2, 14*2+2, 30*2+2, 62*2+2 Q. 92, 6, 14, 30, 62, ? (A) 122 (B) 98(C) 134 (D) 126 Show Answer/Hide Answer Answer: (D) 126Explanation: N/A Q. 104, 16, 36, 64, 100, 144, 196, ? (A) 256 (B) 284(C) 225 (D) 246 Show Answer/Hide Answer Answer: (A) 256Explanation: 2², 4², 6², 8², 10², 12², 14², 16² Q. 1116, 18, 21, 26, 33, ? (A) 46 (B) 44(C) 45 (D) 43 Show Answer/Hide Answer Answer: (B) 44Explanation: N/A Q. 1220, 10, 10, 15, 30, ? (A) 45 (B) 90(C) 60 (D) 75 Show Answer/Hide Answer Answer: (D) 75Explanation; (10/20)=0.5, (10/10)=1, (15/10)=1.5, (30/15)=2 Q. 1328, 32, 41, 57, 82, ? (A) 120 (B) 118(C) 116 (D) 122 Show Answer/Hide Answer Answer: (B) 118Explanation: N/A Q. 1425, 42, 67, 101, 145, ? (A) 200 (B)199(C) 201 (D) 202 Show Answer/Hide Answer Answer: (A) 200Explanation: N/A Q. 1555, 56, 64, 91, 155, ? (A) 265 (B) 275(C) 280 (D) 270 Show Answer/Hide Answer Answer: (C) 280Explanation: N/A Q. 1677, 92, 125, 178, 253, ? (A) 350 (B) 352(C) 353 (D) 351 Show Answer/Hide Answer Answer: (B) 352Explanation: N/A Q. 176, 10, 26, 62, ? (A) 92(B) 126(C) 216(D) 112 Show Answer/Hide Answer Answer: (B) 126Explanation: N/A Q. 1812, 22, 42, 72, ? (A) 102(B) 112(C) 92(D) 122 Show Answer/Hide Answer Answer: (B) 112Explanation: N/A Q. 19 2, 4, 7, 12, 19, 30, ? (A) 38(B) 47(C) 43(D) 36 Show Answer/Hide Answer Answer: (C) 43Explanation: N/A Q. 2019, 9, 28, 37, 65, ? (A) 99(B) 97(C) 102(D) 113 Show Answer/Hide Answer Answer: (C) 102Explanation: 19+9=28, 28+9=37, 28+37=65, 37+65=102 1 2 3 4 » Share on facebook Share on twitter Share on linkedin Share on pinterest Share on reddit Share on whatsapp Share on email Share on telegram Series Completion Reasoning MCQs-1 Series Completion Reasoning MCQs-2 Series Completion Reasoning MCQs-3 Series Completion Reasoning MCQs-4