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CBSE Class 10 Answered

In a society for children, each child gives gift to every other child. If the total number of gifts is 132, find the number of children.
Asked by godson babuji | 15 Mar, 2015, 02:24: AM
answered-by-expert Expert Answer
L e t space t h e space n u m b e r space o f space c h i l d r e n space b e space apostrophe n apostrophe 2 cross times to the power of n C subscript 2 equals 132 rightwards double arrow 2 cross times fraction numerator n left parenthesis n minus 1 right parenthesis over denominator 2 end fraction equals 132 rightwards double arrow n squared minus n minus 132 equals 0 rightwards double arrow n squared minus 12 n plus 11 n minus 132 equals 0 rightwards double arrow n left parenthesis n minus 12 right parenthesis plus 11 left parenthesis n minus 12 right parenthesis equals 0 rightwards double arrow left parenthesis n minus 12 right parenthesis left parenthesis n plus 11 right parenthesis equals 0 therefore n equals 12 space N u m b e r space o f space c h i l d r e n space i s space 12.
Answered by Prasenjit Paul | 15 Mar, 2015, 09:31: AM

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CBSE 10 - Maths
1.The mean weight of 9 students is 25 Kg. if one more student is joined in the group, the mean is unaltered. Find the weight of 10th student 2.If the nth term of an A.P is pn+q find its common difference.
Asked by purbashadebnath1980 | 09 Mar, 2024, 12:10: PM
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CBSE 10 - Maths
find the sum of following 6+13+20+....+97
Asked by deepikaselvam2009 | 20 Feb, 2024, 08:57: PM
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CBSE 10 - Maths
If the sum of the first n terms of an AP be n and the sum of first n terms be m then sum of its (m+n) terms is -(m+n)
Asked by keshavsinghalhapur | 16 Jan, 2024, 08:46: PM
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CBSE 10 - Maths
If the sum of first n,2n and 3n terms of an AP be S1 S2andS3 respectively then p3 S2-S1
Asked by keshavsinghalhapur | 15 Jan, 2024, 10:56: AM
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CBSE 10 - Maths
which term of the AP 3,8,13,18.....is. 78?
Asked by durgauikey7000 | 08 Dec, 2023, 08:16: PM
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CBSE 10 - Maths
A contract on construction job specifies penalty for delay of completion beyond a certain date as follows Rs. 200 for 1st, Rs. 250 for 2nd, and Rs. 300 for 3rd, so on. If contractor pays Rs. 27,750 as penalty, find the number of days for construction work delayed.
Asked by skandachiranjeevin | 06 Dec, 2023, 07:08: PM
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CBSE 10 - Maths
5,2,-1....-49 is an arithmetic progression so it has blank terms
Asked by shaikhyakub9946 | 30 Nov, 2023, 11:50: AM
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CBSE 10 - Maths
The sum of the first 7 terms of an AP is 63 and that of its next 7 terms is 161.find the AP
Asked by prassanna.j | 13 Nov, 2023, 11:24: PM
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CBSE 10 - Maths
if m times the m th term of an AP is equal to n times the n th term, show that the (m+n) th term of the AP is zero
Asked by prassanna.j | 13 Nov, 2023, 11:23: PM
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CBSE 10 - Maths
If the pth term of an AP is 1/q and qth term 1/P. Prove that the sum of the first pqth term is 1/2 (pq + 1).
Asked by latayadav23 | 17 Oct, 2023, 08:39: PM
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