Find the sum of all integers between 84 and 719 which are exactly divisible by 3

Monjur Alahi

5 views

2025-01-04 04:42

1 Answers

Salim Ahmed Kawsar

The sequence is 87, 90 ... 717

a = 87, a_n = 717, d = 3

a_n = a + (n - 1)d

717 = 87 + 3n - 3

633 = 3n

n = 211

S₂₁₁ = n/2 (a + a_n)

= 211/2 (87 + 717)

= 211 × 402

= 84822

5 views Answered 2023-02-05 15:29

Related Questions

Three unbiased coins are tossed once. Find the probability of getting (i) exactly 2 tails (ii) exactly one tail (iii) at most 2 tails (iv) at least 2

2 Answers 7 Views

Five years ago, the sum of the ages of a father and two sons was \( x \) years, then after five years, the sum of the ages of all will be years.

2 Answers 6 Views

Find the values of a and b so that the polynomial x4 + ax3 – 7x2 +8x + b is exactly divisible by (x + 2) as well as (x + 3).

2 Answers 4 Views

If n is odd, then an + bn is divisible by (a + b) and an− bn is divisible by (a − b). If n is even, then an− bn is divisible by (a − b) and (a + b) .

2 Answers 6 Views

Find the sum of all numbers between 200 and 300 which when divided by 7 leaves remainder 1. [Class 11 Maths]

2 Answers 5 Views

The sum of three numbers is 2. If twice the second number is added to the sum of first and third, we get 1. On adding the sum of second and third numb

2 Answers 5 Views

Find the consecutive even integers whose squares have the sum 340.

2 Answers 4 Views

Predict the output. 1. int sum = 10, ctr = 5; sum = sum + ctr–;

2 Answers 5 Views

Find the sum of all odd numbers between 0 and 50.

2 Answers 5 Views

If `ax^(2)+bx+c` is exactly divisible by `4x+5` , then

2 Answers 4 Views

এক্সাম দিয়ে মেধা যাচাই করুন

Job Preparation (1125)

Admission (754)

এসএসসি (10)

এইচএসসি (5)