Question
What is the average of the first eight triangular
numbers?Solution
ATQ,
Triangular numbers are the numbers obtained by continued summation of natural numbers.
First eight triangular numbers = 1, 3, 6, 10, 15, 21, 28, 36
Required average = (1 + 3 + 6 + 10 + 15 + 21 + 28 + 36) ÷ 8
If  `grad`  means +, # means -, @ means `-:`  and & means `xx` , then,
59 &Â 2 `grad` Â 30 @ 6 # 54 = ?
In the questions given below there are three statements followed by two conclusions I and II. You have to take the three given statements to be true ev...
When all the letters of the word ‘CLARIFIED’ are replaced by its immediately preceding letter as per the English Alphabetical series, then how many ...
How many pairs of letters are there in the word ‘SURRENDER’ which has as many letters between them in the word (both forward and backward) as in the...
If each of the digits in the number '498953627' are arranged in ascending order from left to right, what will be the difference between the digits, whi...
How many such digits are there in the number 86732459 each of which is far away from the beginning of the number as when the digits are arranged in desc...
- How many pairs of letters are there in the word "PROMOTIONAL" which has as many letters between them in the words as in English alphabetical series (only i...
If we add ‘1’ to all the even digits of the number 7328786493478, then, which digit(s) appears, more than twice after the rearrangement?Â
Given below are four combinations [i], [ii], [iii] and [iv] of five words. In each combination you have to arrange the letters in English alphabetical o...
How many pairs of letters are there in the word ‘PARALLEL’ which has as many letters between them (both forward and backward) in the word as in the ...
