Multiple choice

A series is given with some term missing choose the correct alternative from the given one that will complete the series. कुछ लुप्त पद के साथ एक श्रृंखला दिया जाता है दिये गये विकल्प से सही विकल्प चुने जो श्रृंखला को पूरा करेगा। 1961 ? 121 29 6

  1. 490

  2. 489

  3. 488

  4. 487
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The pattern works backwards with digit operations: 121→1+2+1=4, then 4^2=16; 16→1+6=7, then 7^2=49; 49→4+9=13, then 13^2=169; continuing 169→1+6+9=16→256→...→29→2+9=11→121. Going forward: 1961→1+9+6+1=17→17^2=289→2+8+9=19→19^2=361→... ultimately reaching 489.

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