Maths Class 5 Numerals

Asked by AKSHAY GURU VARADHARAJAN · SRI CHAITANYA TECHNO SCHOOL, JAYANTI NAGAR.

Which option shows a pair of twin primes that is greater than 130 and less than 140?

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A 131 and 133
B 137 and 139
C 133 and 135
D 130 and 140

Show answer and explanation

Answer: B. 137 and 139

The correct answer is B. 137 and 139.
Step 1: Check numbers between 130 and 140 for primality (131, 133, 137, 139).
Step 2: Note that 133 is not prime (7 x 19), but 137 and 139 are both prime.
Step 3: Since 139 minus 137 equals 2, they are the only twin primes in this range.

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Which option shows a pair of twin primes that is greater than 130 and less than 140?

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