RRB NTPC CBT-1 (Undergraduate)20 Jun 2026Shift 2Number, Letter and Symbol Arrangement

Refer to the given number series and answer the question. All numbers are single-digit. Counting is to be done only from left to right. (Left) 3 9 5 3 8 4 4 2 9 8 9 4 6 6 5 7 7 2 4 1 3 6 3 (Right) How many even digits are there, each of which is immediately preceded by an odd digit and immediately followed by an even digit as well?

दी गई number series देखकर प्रश्न का उत्तर दीजिए। सभी numbers एक digit की हैं। गिनती केवल बाएँ से दाएँ करनी है। (बायाँ) 3 9 5 3 8 4 4 2 9 8 9 4 6 6 5 7 7 2 4 1 3 6 3 (दायाँ) ऐसे कितने even digit हैं, जिनमें से प्रत्येक के ठीक पहले odd digit और साथ ही ठीक बाद भी even digit है?

Answer और ExplanationAnswer and explanation

Answer: (C) Three

दिया है: 23 digits की series। ज्ञात करना है: ऐसे even digit जिनके बाएँ odd और दाएँ even digit हों।
1
code line लिखें: O O O O E E E E O E O E E E O O O E E O O E O।
2
condition 'even, जिसके पहले odd और बाद में even' का pattern O E E है, और बीच वाला even digit गिना जाता है।
3
O E E का pattern बीच वाले खाने के साथ position 5, 12, 18 पर मिलता है (digit 8, 4, 2)।
✓
उत्तर Three है।
Given: a 23-digit series. To find: evens with odd on the left and even on the right.
1
Write the code line: O O O O E E E E O E O E E E O O O E E O O E O.
2
The condition 'even, preceded by odd, followed by even' is the pattern O E E, and the even digit in the middle is counted.
3
The pattern O E E has its middle cell at places 5, 12, 18 (digits 8, 4, 2).
✓
The answer is Three.
SMART APPROACH

code line लिखें, फिर O E E ढूँढें। position 10 का 8 जैसे even digit फेल हो जाते हैं, क्योंकि उनके बाद odd digit है।

Code line, then look for O E E. Evens such as 8 (place 10) fail because an odd digit follows them.

Source: RRB NTPC CBT-1 (Undergraduate) · 20 Jun 2026 · Shift 2। Solution: Prashant Sir, Kavach।Source: RRB NTPC CBT-1 (Undergraduate) · 20 Jun 2026 · Shift 2. Solution by Prashant Sir, from Kavach.