What is the sum of the first 9 terms of an arithmetic progression if the first term is 7 and last term is 55?
1). 219
2). 137
3). 231
4). 279
Sum of first 9 terms can be given as
⇒ sum = 9(7 + 55)/2 = 9 × 31 = 279
∴ the sum of first 9 terms is 279
1. How many numbers between 300 and 800 can be by using digits 2, 4, 5, 6 and 0 ?
2. Find the smallest number which when divided by 13 and 16 leaves respective remainders of 2 and 5.
4. If 347P is divisible by 9, then what is the value of P?
6. In how many different ways can the letters of the word ANATOMY be arranged ?
7. If 4x - 5(2x - 1) > 2x + 3 > 2 - 3x; then x can take which of the following values?