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Find the missing term: 1023, 987, 915, 807, ?
A636
B663
C543
D632
Answer & Solution
Correct answer: B. 663
1. Differences: 1023 − 987 = 36; 987 − 915 = 72; 915 − 807 = 108.
2. The subtracted values are 36, 72, 108 — multiples of 36, so the next is 144.
3. 807 − 144 = **663**.
_Source: IBPS RRB Officer Scale I Prelims PYQ (Examrace), Q.75_
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