Counting Figures| Triangles Counting| Reasoning on Counting Figure | Reasoning Classes| #shorts

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Counting Figures| Triangles Counting| Reasoning on Counting Figure | Reasoning Classes| #shorts

[koushalkhan]

One and only rule for this type of questions to find out triangles is:
For even base: [n(n+2)(2n+1)]/8 👈here 'n' is the number of the base of the given triangle in question
Example: [6(6+2)(2*6+1)]/8
=[48*13]/8
=624/8
=78
For odd base: [n(n+2)(2n+1)-1]/8
=[3(3+2)(2*3+1)-1]/8
=[15*7-1]/8]
=[105-1]/8
=104/8
=13
Here the answer of the question of this video is 78 because the number of the base of the given question is an even number that is why it follows the first rule

[adityachoudhary]

n(n+2)(2n+1)/8, where n is no. of base

6×8×13/8=78 ans
It's for even n

[Shorthand_Baba.]

Better to use...n(n+2)(2n+1)/8...N means no of triangles at base

[sumitjangra]

Option bbb78 thanku sir ji best series of short question please provide this type of another shorts questions and answers for our upcoming exams thanku sir ji best series of short question 🎉🎉❤❤❤

[hyper-ff]

Easiest way - (6×6)2-5 = number of triangles

[PrakharRSingh]

Use n(n+2)(2n+1) whole divided by 8; round if off according to the options, take the nearest.

[sumitjangra]

Option bbb 78 thanku sir ji best series of short question please provide this type of another shorts questions and answers 🎉

[punambhuyan]

67 is right answer.
Because, total 36×2=72-5=67

[SURENDRASINGHdream]

Kya kr rha h bhai pehele 2n^-5 ka formula diya usse to y hua hi nhi 67 answer aa rha h.

[staticgkindiaworld]

79 hoga last me ek overall triangle judega

[SSSwaraj]

2n²-5=
2×6²-5=
2×36-5=
72-5=
67ans.🎉🎉🎉

[HinduDharam-vkkd]

2*n-5se krege to 67aayega or 5ke squire krege to 25+25+25=75

[DisciplineHeart-vz]

n no. Total triangle

1 1
2 5
3. 13
4. 27
5. 48
6. 78
7. 118
Yeh yaad karlo isse acccha