first term, a = 7

common difference, d = 8

number of term, n = 100

a + (n - 1)*d = 7 + (100 - 1)*8 = 7 + 99*8 = 7 + 792 = 799

in 800th position, 5 is situated

therefore in 799th position 4 is situated.

ans is 4

## Search found 25 matches

- Sat Dec 12, 2015 7:31 pm
- Forum: Secondary Level
- Topic: Maymensingh divisional 2014 Q.no.- 4
- Replies:
**1** - Views:
**1083**

- Sat Dec 12, 2015 7:27 pm
- Forum: Secondary Level
- Topic: Maymensingh divisional 2014 Q.no.- 4
- Replies:
**1** - Views:
**1083**

### Maymensingh divisional 2014 Q.no.- 4

In the given diagram a square is marked with circle. Which number will be inside the square 100th position upper than this one?

- Sat Dec 12, 2015 6:58 pm
- Forum: Secondary Level
- Topic: coxbazar divisional 2014 Q.no.-5
- Replies:
**0** - Views:
**876**

### coxbazar divisional 2014 Q.no.-5

The first number in an arithmetic progression is 23 and the last number is 52. Difference between successive terms is rational. The progression contains no more than 291 terms. How many such sequences can be formed?

- Sat Dec 12, 2015 6:31 pm
- Forum: Secondary Level
- Topic: coxbazar divisional 2014 Q.no.-2
- Replies:
**2** - Views:
**1936**

### coxbazar divisional 2014 Q.no.-2

Hasib went to the kite festival with five friends and bought 12 kites. They were all of different colors. He and his friend Tahmid took 2 kites and told the others to pick any one among other kites. In how many ways can they do it?

- Sat Dec 12, 2015 6:27 pm
- Forum: Secondary Level
- Topic: coxbazar divisional 2014 Q.no.-1
- Replies:
**1** - Views:
**1097**

### coxbazar divisional 2014 Q.no.-1

Avik runs twice as fast as Tusher. Kamrul runs 4 times slower than Tusher. They started running together. After some time if the distance between Kamrul and Avik is 105 meters than find the total of the distances they covered individually.

- Sun Nov 22, 2015 7:10 pm
- Forum: Secondary Level
- Topic: Inequality
- Replies:
**0** - Views:
**827**

### Inequality

The inequality \[ \frac{x|x-2|(x-4)|x-6|...|x-2014|}{(x-1)|x-3|(x-5)|x-7|...|x-2015|} > 0\] does not hold for a finite number of intervals on the real number line. What is the sum of the length between the points 0 and 1 is 1 unit long.

- Tue Nov 17, 2015 5:56 pm
- Forum: Number Theory
- Topic: prove it!!!
- Replies:
**2** - Views:
**953**

### prove it!!!

Let $$a_1, ........., a_n$$ be any non-zero integers whose g.c.d is $$d$$. Then there exist integers

$$x_1, ....., x_n$$ such that $$a_1 x_1 ++.....+a_n x_n = d$$.

$$x_1, ....., x_n$$ such that $$a_1 x_1 ++.....+a_n x_n = d$$.

- Wed Nov 04, 2015 8:56 pm
- Forum: Secondary Level
- Topic: geometry
- Replies:
**3** - Views:
**2121**

### geometry

In $$ΔABC$$, $$∠B = 90$$. A circle is drawn taking $$AB$$ as a chord. $$O$$ is the center of the circle. $$O$$ and $$C$$ isn't on the same side of $$AB$$. $$BD$$ is perpendicular to $$AC$$. Prove that, $$BD$$ will be a tangent to the circle if and only if $$∠BAO = ∠BAC$$.

- Thu Sep 03, 2015 3:41 pm
- Forum: Secondary Level
- Topic: If x is very very very small........
- Replies:
**0** - Views:
**767**

### If x is very very very small........

If $$x$$ is very very very small $$sin x » x$$. An operator $$S_n$$ is defined such that

$$S_n(x)= sin sin sin .... x $$(a total of $$n$$ $$sin$$ operators are included here). For

sufficiently large $$n$$, $$S_n(x) » S_(n-1)(x)$$. In that case, express cos $$(S_n(x))$$ as the

nearest rational value.

$$S_n(x)= sin sin sin .... x $$(a total of $$n$$ $$sin$$ operators are included here). For

sufficiently large $$n$$, $$S_n(x) » S_(n-1)(x)$$. In that case, express cos $$(S_n(x))$$ as the

nearest rational value.

- Thu Aug 06, 2015 9:35 pm
- Forum: Secondary Level
- Topic: chittagong-divisional-2014
- Replies:
**1** - Views:
**1275**

### chittagong-divisional-2014

If $$a$$,$$b$$ are co-prime and $$a$$ $$=$$ $$259$$, find gcd of $$a^2$$ $$-$$ $$ab$$ $$–$$ $$b^2$$ and $$a$$ $$+$$ $$b$$.