What is the sum of the first 13 terms of an arithmetic progression if the first term is -10 and last term is 26?
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Find the average of all prime numbers between 20 and 50.
The sum of a non-zero number and thrice its reciprocal is 52/7. Find the number.
A number is greater than twice its reciprocal by 31/4. Find the number.
What is the digit in unit's place of the product 51 x 52 x 53 ...... 59?
Sum of twice a fraction and 5 times its reciprocal is 7. What is the fraction?
Product of digits of a 2-digit number is 18. If we add 63 to the number, the new number obtained is a number formed by interchange of the digits. Find the number.
The 7th and 12th term of an arithmetic progression are -15 and 5 respectively. What is the 16th term?